how to tig weld aluminum
how to tig weld aluminum

Welding light metals such as aluminum represent a challenge compared to welding steel alloys.

And welding aluminum requires excellent precision to achieve a solid bond.

But what kind of welding will allow us this? If you do not know the types of welding, the difference between them, and the advantages and disadvantages, visit our article dedicated to the different types of welding.

learn to weld aluminum

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But do not worry because this article will explain everything you need to know to learn to weld aluminum.

Also, we show the different methods used for welding aluminum, and the choice will depend on the particular needs of your project.

Let us begin!

Review contents

Before We Start

It is best to go step by step, so first, we will explain what you should know before you start welding.

Thus, you can understand the whole process better and choose your method better.

 What is aluminum?

Aluminum is a light and thin metal and is one of the most used materials in welding.

Despite being light (the density of aluminum is one-third of steel), it is solid and resistant, making it popular.

learn about aluminum
Learn about aluminum

It has a shallow melting point of about 660 ° C and is a very conducive electricity and heat element.

This is why pure aluminum is widely used in electrical applications since its electrical conductivity is superior to alloys.

It is a very malleable metal and has a meager mechanical resistance.

Therefore, it is usually alloyed with different metals to harden and improve mechanical characteristics. And in this way, the alloys have better mechanical strength than pure aluminum.

Why is aluminum so difficult to weld?

The aluminum must be welded at a low temperature with a lower melting point and a very high conductivity. Burns will be created if this is not done, boring the metal.

It is also a reasonably reactive material, which causes it to form an oxide layer when exposed.

The result of this quality is usually porous welds, which is a problem.

To avoid this, you have to clean the aluminum well before welding (we will explain later) and work very quickly since, in a few minutes, it usually comes out again.

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Aluminum Alloys

As mentioned, aluminum is alloyed with different metals to achieve more potent and durable metals.

Typically, these alloys are created with copper (Cu), Magnesium (Mg), Silicon (Si), and Zinc (Zn). To this, other metals are added in small quantities, such as Chrome (Cr), Iron (Fe), Nickel (Ni), and Titanium (Ti).

Thus, there are many aluminum alloys, all of them with characteristics superior to pure aluminum.

learn about aluminum
Learn about aluminum

These alloys can be obtained by different techniques and molding or processes that lead to deformation, such as lamination and forging.

Classification of aluminum alloys

As mentioned, there are many types of aluminum alloys, but in this section, we will only consider aluminum alloys for forging since these are the ones used for welding.

Regarding the classification, we can distinguish two different categories. The first is vocabulary and typing, according to UNE 38-300. According to the Aluminium Association (AA), the second is the vocabulary, also known as the American classification.

According to UNE 38-300, aluminum and aluminum alloys for forging constitute the L-3XXX series.

This series is classified into different groups according to the main alloy elements.

And according to the Aluminium Association classification, each alloy is given a four-digit number, and the first is the one that shows the primary alloys.

Alloy UNE 38-300 Aluminium Association
Aluminum (minimum purity: 99.00%) Group L-30XX 1XXX
Aluminium-Copper Alloys (Al-Cu) Group L-31XX 2XXX
Aluminium-Magnesium Alloys (Al-Mg) Group L-33XX 5XXX
Aluminum-magnesium-silicon Alloys (Al-Mg-Si) Group L-34XX 6XXX
Aluminum-Silicon Alloys (Al-Si) Group L-35XX 4XXX
Various alloys Group L-36XX 8XXX
Aluminium-Zinc Alloys (Al-Zn) Group L-37XX 7XXX
Aluminium-Manganese Alloys (Al-Mn) Group L-38XX 3XXX
Aluminium-Tin Alloys (Al-Sn) Group L-39XX

Characteristics and weldability of alloys

Once we have seen what the forging alloys are, we will see what the characteristics of each of them and weldability of each of them are.

We can also distinguish two different groups regarding weldability among all these alloys.

And we can distinguish between bondable alloys (heat-treatable alloys) and non-bondable, these being non-heat-treatable alloys.

The heat treatment known as the bonus is heating the material to 500 ° C to cool it quickly. According to the alloy, maturation will be carried out, both natural and artificial.

The first is to keep it at room temperature, while the second is about 200 ° C.

When this treatment is performed on the bondable alloys, their hardness and mechanical strength increase, but non-bonuses do not change their properties with treatment.

Next, we will show which alloys are non-bondable since alloys of this type are weldable.

As for bonus alloys, welding is not recommended for many, although some can be welded. Let’s go there!

Aluminum Alloys

This is the L-30XX Group according to the UNE and 1XXX according to AA.

These alloys, having a minimum purity of% 99, are almost pure Aluminium.

And as we have said before, pure Aluminium is mainly used in electrical applications.

These types of alloys are non-bondable, being weldable for them.

The essential weldable alloy of this Group by the TIG and MIG processes is the L-3001 (UNE) / 1100 (AA) alloy. However, this alloy is also weldable by other types of welding, such as point resistance or seam, with solid or soft welding.

Aluminum and Copper Alloys

This is the L-31XX Group of the UNE nomenclature and 2XXX of the AA. Typically, these alloys are made of copper and coated with Aluminium.

They are solid materials but not very resistant to corrosion. It is usually used mainly in the manufacture of airplanes.

These are bonus alloys, so welding is not recommended for most welding.

However, the L-3191/2219 alloy can be welded by TIG and MIG by resistance by stitches or seam, and the alloy L-3140/2024 by resistance by stitches or by stitching.

Aluminum and Magnesium Alloys

These alloys are within the L-33XX Group of the UNE and 5XXX within the AA nomenclature.

These are easy-to-use metals, and they are also resistant to corrosion. But instead, they are not the strongest metals mechanically.

Also, special care must be taken, and temperatures too low should be avoided, as it can be dangerous.

There are some bonuses and some non-bonus alloys, and many can be welded, either by MIG / TIG or by resistance by stitches or by sewing.

These weldable alloys are the following: L-3360 (UNE) / 5052 (AA), – / 5652, L-3321/5083, L-3322/5086, L-3390/5454
and – / 5456.

Aluminum, Magnesium, and Silicon Alloys

Aluminum, magnesium, and silicon alloys are part of the UNE Group L-34XX and 6XXX regarding the Aluminium Association.

They are solid and versatile alloys and stand out because they can be treated with heat.

This is because of the proportion they contain Silicon and magnesium.

These alloys are bondable, but most of the alloys can be welded by MIG / TIG, point resistance, seam, or solid welding.

Some of them are also by gentle welding. Here are the weldable alloys: L-3420/6061, L-3441/6063, and finally, L-3431/6101 and L-3451/6351, which can also be welded by smooth welding.

Aluminum and Silicon Alloys

These Aluminium and silicon alloys are Group L-35XX and 4XXX in the AA.

The Silicon contains causes the melting point of Aluminium to be significantly reduced. Therefore, it is not uncommon to find welding electrodes of this Group.

However, there are a bonus and non-bonus alloys, and welding by typical processes is not recommended for alloys of this type.

Various alloys

In Group L-36XX, belonging to the UNE, what would be the terminology 8XXX of the AA? Since they are different alloys, you cannot accurately describe them.

Aluminum and Zinc Alloys

The Aluminium and Zinc alloys constitute the L-37XX Group and the 7XXX of the UNE and AA, respectively.

These alloys have very high resistance and are also widely used in aeronautics. In addition to Zinc, they usually contain some magnesium, which means they can be heat treated.

They are bonus alloys, and although the vast majority cannot be welded, some alloys are suitable for welding by MIG / TIG processes and spot welding or sewings, such as L-3741/7005 and L-3731/7039. And the L-3710/7075 alloy can be spot welded or sewn.

Aluminum and Manganese Alloys

The L-38XX Group of the UNE and the 3XXX of the AA name the Aluminium and Manganese alloys. They usually have about 1.5% manganese.

The most significant advantage is that they are straightforward to work with. Although they cannot be treated with heat, this alloy is a good option to enter the world of Aluminium and Aluminium alloy welding.

Aluminum and manganese alloys are non-bondable; two alloys stand out for their weldability; L-3810/3003 and L-3820/3004.

The first can be welded with TIG / MIG and by resistance by a point or seam, and the second, in addition to these processes, can also be welded by strong welding and smooth welding.

Aluminum and Tin Alloys

These alloys do not have a vocabulary in the AA but are from the L-39XX Group of the UNE.

Recommendations to start welding

Now that you know a little more about aluminum and its characteristics and weldability, we will tell you the steps you must follow to start welding finally.

Clean from aluminum

To weld without problems, the Aluminium parts have to be extremely clean.

Aluminum usually forms a thin layer of aluminum oxide, which melts at a much higher temperature than Aluminium.

This is a danger since if there is a little rust, it can generate inclusions of rust in the weld, reducing the resistance of the weld.

The simplest way to perform this cleaning is usually mechanical, with a wire brush. Always use clean brushes or brushes that have only been used to clean Aluminium.

The brushes used with other metals can leave traces of those metals that can affect the weld’s quality.

Another thing to remember is to brush gently because if you do it sharply, you can embed the oxides more in base Aluminium.

Select the appropriate input material for Aluminium

Both rods and coated wires and electrodes can be used as filler metal for Aluminium welding:

Coated electrodes for welding Aluminium

Coated electrodes are used with direct reverse polarity (DC +) current. You must be very careful with moisture, and better if you dry them before using them for welding. Otherwise, they can produce spores.

It would be best if you chose the most similar to your base Aluminium, these being the most common electrodes:

Electrode designation Electrode composition
E 1100 Pure Aluminium
E 3003 Aluminum – 1% Manganese
E 4043 Aluminum – 5.2% Silicon (Alloy for the manufacture of electrodes and welding rods)

Wires and rods for welding Aluminium

In the same way, if you choose a rod, select an Aluminium filling material of a melting temperature similar to that of the base Aluminium.

Remember that the rods have to be clean to get a good weld.

The most common is usually the 4043 and 5356 alloy rods. You can opt for either if you don’t have it very clear.

Rod Designation Chemical composition of the rod
ER 1100 Pure Aluminium
ER 2319 Aluminum – 6% Copper – 0.3% Manganese (It is a variant
of 2219)
ER 4043 Aluminum – 5.2% Silicon (Alloy intended for
electrode and rod manufacturing)
ER 4047 Aluminum – 12% Silicon
ER 4145 Aluminum – 10% Silicon – 4% Copper
ER 5183 Aluminum – 4.5% Magnesium – 0.65% Manganese (It is a
5083 variant)
ER 5356 Aluminum – 5% Magnesium – 0.3% (Manganese + Chrome)
ER 5554 Aluminum – 2.9% Magnesium – 0.65% Manganese
ER 5556 Aluminum – 5% Magnesium – 0.7% Manganese
ER 5654 Aluminum – 3.5% Magnesium

Use a fill rod of the same size as the tungsten electrode.

Hold the workpieces

Before you start welding, you have to ensure that the pieces you have to weld will not move during the process.

To do this, you can use clamps and thus securely attach them to your worktable.

Never forget about protection.

As we mentioned in our articles, protection is vital for welding, so the more you protect yourself, the safer you will work.

welding-jacket
welding-jacket

You don’t need the complete equipment, but you should have gloves and a darkening helmet.

Also recommended are the welding apron, the respiratory mask, and safety shoes.

Preheat the Aluminium

Preheating, in general, is usually not necessary.

But the pieces of great thickness are an exception since, in this case, the preheating can reduce the thermal contribution to obtain suitable fusion.

Preheating is usually usual when using the TIG process but not when using MIG welding.

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Weld Aluminium with TIG

TIG welding is the most commonly used process for welding Aluminium.

And it is that a welding machine that can control the current is handy to prevent the Aluminium part from overheating and causing burns.

This is because Aluminium needs a lot of heat to reach its temperature, but it can keep a long time once it goes.

Also, TIG welding can be used in thin and thicker Aluminium.

Before starting with all the steps, I leave you a great video about TIG welding for Aluminium:

For TIG welding of Aluminium, a shielding gas is used. Argon is usually used due to its good cleaning action and penetration profile, and 3% helium can also be added for more excellent arc stability.

But if what will be welded is an Aluminium and magnesium alloy, a mixture of argon with helium (a maximum of 75% helium) is recommended to minimize the creation of magnesium oxide.

A high-frequency current is used to facilitate the arc’s priming without touching the electrode on the piece.
Also, square wave energy sources are used to lengthen the period in which the electrode is positive and the pickling of the piece occurs.
In this type of alternating current welding, pure tungsten electrodes or tungsten electrodes with zirconium oxide are used.
Tungsten electrodes with thorium can also be used when using a square wave.

TIG welding for Aluminium with the direct-current negative electrode (CC-)

This method is used to weld Aluminium parts of great thickness without preheating.
It is usually used in automatic welding and helium as a protective gas.
Although no preheating is needed, pickling is necessary. After welding, the oxide layer is removed by mechanical brushing.

Steps to follow to weld Aluminium with TIG

  1. Set the correct amperage for your project. You must calculate that you need 1 amp for every 0.025 mm thick Aluminium. Do the approximate calculation, and if in doubt, raise a little more since you can adjust it with the pedal.
  2. Prepare the tools to work. You have to extend the tungsten electrode to a diameter similar to the nozzle you will use. Support the electrode tip on the metal piece, and keep it about 3 mm.
  3. Use the pedal and the torch button to adjust. The torch usually has control to create the electric arc. So you will need to press it to start welding. If, on the contrary, the torch does not have any buttons, you have to create the arc with the pedal. It would be best if you pressed it halfway. You probably have to raise the amperage if you can’t generate the angle.
  4. Create the welding puddle. You must meet the material to create the pool of solder necessary to fill the joint. Go forward through the entire union until you finish welding everything. The disadvantage is that the Aluminium will heat up over time, so you should reduce the amperage not to burn the piece as you go along.
  5. Please wait for it to cool. Once you have done the joint welding, you must wait for everything to cool.

Weld Aluminium with MIG

MIG welding can also be used to weld Aluminium.

It is the most suitable process for thin Aluminium sheets due to the heat they need.

I leave a video as a warm-up:

The wire feeding system can be a drag, push, or drag-push.

This will depend on the thickness and hardness of the alloy. Also, constant voltage power sources with regular speed feeders are used for small-diameter wires.

In contrast, constant-intensity power sources and variable-speed feeders are used for large-diameter wires.

Argon is a protective gas since pure argon is the best gas for aluminum MIG welding.

As for the transfer gases, different types of transfer can be used, although the transfer typically used in MIG welding of Aluminium is usually the transfer of spray or spray.

The technique for welding Aluminium with MIG

The forward welding technique tilts the gun about 7º to 12º toward the welding direction.

To turn off the arc, the speed is increased until the electrode is separated from the workpiece, or the other option is to change the welding direction and cut the angle on the welding bead.

Appendices can also be used to extinguish the arc over them. Alloys that are bondable are welded with straight strands.

Finally, you should know that MIG welding of Aluminium has some disadvantages, such as imperfections that can be created, such as melting faults, cracks in the crater, porosity, and inclusion of oxides.

Weld Aluminium by an electric arc with coated electrode

Aluminum can also be welded by an electric arc, although it is not highly recommended because the cord obtained is usually not homogeneous.

But if you need to perform welding where this is not a problem, this type of welding may be an option.

Remember that the electrodes must be completely dry and clean to use without problems, so it is advisable to dry them.

Also, it would be best if you preheated the pieces in case they are complicated and of great thickness.

And it is that a thickness of 3 mm is minimally recommended to use in this welding process on Aluminium.

With more than 6 mm, a V chamfer from 60º to 90º must be made, and for large thicknesses, the U preparations are recommended.

After welding, the slag must be removed with a brush, pickaxe, and with the help of hot water.

And it is that the slag favors the corrosion of Aluminium.

Weld Aluminium by Oxigas

Oxigas can weld aluminum alloys and the Aluminium itself, but it is recommended to use this process only for minor repairs and welding.

Above all, you can use it if the thicknesses of your pieces range between 0.7 and 25 mm.

This process has the advantage of being straightforward but also has a few disadvantages.

And, among other things, you have to use filler material. The process is prolonged, deformations occur, and it deforms very easily.

The fuel used in acetylene with a neutral flame, although sometimes aflame with enough acetylene, can reduce the formation of oxides.

Single V chamfers are made if the pieces are thicker than 5 mm. They can be made with amounts up to 12 mm.

B backing plates or overlapping joints are not recommended since the flux can remain there and cause corrosion in the base metal.

If the thickness of the piece is large, a preheat should be performed before welding. To do this, you have to move the flame circularly and heat the edges of the joint until the melting bath is formed.

The contribution metal rod will be placed, and the joint will continue advancing until all the material is melted.

After welding, all remaining flux residue must be removed. To do this, you have to bathe the pieces of water with small amounts of nitric or sulfuric acid and then wash them with water. Large pieces can also be steam cleaned.

Weld Aluminium by Strong Welding

Some alloys can be welded by brazing, although most alloys cannot be welded by this method.

What you have to look to know if you can or not is the melting temperature of the metal.

And it is that many times the melting temperatures of the base metal and the contribution metal are usually very similar, as is the case with Aluminium and copper alloys, and some Aluminium and zinc alloys, such as 7055, 7178, and 7001 (AA)

Aluminum and silicon alloys are typically used as filler metals. To select the correct metal, you must ensure that the melting temperature of the filler material is lower than the base metal.

And more if a blowtorch does welding.

The paste is applied in the form of a paste, and it is recommended not to use too much so as not to have problems with corrosion.

After welding, remove the flux with hot water and a fiber brush, never a wire brush.

Weld Aluminium by Soft Welding
Weld Aluminium by Soft Welding

Weld Aluminium by Soft Welding

To perform smooth welding, a flux is needed to remove the oxide layer and to avoid contact with air, among other things.

You always have to eliminate waste from this flux, as they absorb moisture.

They are removed quite quickly with hot water.

The materials usually used in the contribution metals are tin, Zinc, lead, and cadmium.

But the best mechanical properties are the high-temperature zinc filler metals since they also have excellent corrosion behavior.

How to “Weld” Aluminum for Beginners

People also ask

What kind of welder do you need to weld aluminum?

MIG welding is best for thinner gauges of aluminum sheets because of the amount of heat needed. When choosing a shielding gas, one hundred percent argon is best for MIG welding aluminum.

To create a quality weld, the welder must choose a welding wire or rod with an alloy similar to the workpieces.

Is it difficult to weld aluminum?

Aluminum doesn’t act the way other metals do during welding, so it can be challenging to determine weld progress and quality.

Simply put, aluminum is difficult to weld because it is a soft, susceptible metal insulated by a more rigid oxidized layer.

Can you stick weld aluminum?

MIG, DC, is much faster than TIG, but it is not nearly as controllable because you cannot melt the base metal without adding filler metal. …
Neither TIG nor MIG can weld aluminum in breezy conditions.
However, stick welding aluminum is possible with a DC stick welder, which works better than I expected.

Can I weld aluminum with a MIG welder?

Aluminum is a tricky metal to weld with a MIG welder because it takes more heat than mild steel (Usually in the range of 21 to 24 volts).

When MIG welding mild steel, you can and should move the MIG gun slowly enough to get deep penetration.

Can you use a wire feed welder to weld aluminum?

When using a wire welder, the problems of aluminum welding increase because the aluminum wire is prone to crumple and bend.
Proper preparation is the key to successful aluminum welding when using a wire welder.

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