Welding of aluminum : how to work with the material ?

Species processes

Separate the two types of welding - MIG and TIG.With the latter characterized by speed below MIG-welding three times, but the quality of the welds have much higher then no pores.

As welding and aluminum What is special?

Anyone who is engaged in welding material, at least minimally familiar with the properties of a material.It is necessary to understand what it represents aluminum welding.

Surprisingly, pure aluminum has a conductivity of three times greater than that of steel and many other materials.Aluminum conducts heat well is much better, imagine 2.2 W / cm.K - for aluminum and 0.6 W / cm K - that of steel.

This feature speeds up welding and reduces the depth of penetration.pore formation in the weld - a consequence of reducing the amount of time for the crystallization of the weld pool, due to the gas evolution which is incomplete.To ensure that this does not happen, it is important to increase the value of the welding current and heat welded parts helium or other inert gas.

welding components and wire

alloy of aluminum - for now commonly used item that is important to use the right time.Because an open package with wire products rapidly oxidized and the material loses its properties.The same thing happens with sutures.Each pre-up process must be free from grease, various contaminants.Next, a layer of aluminum oxide of aluminum, which collapses when welding AC and DC return connection.

Shielding gas

Production of aluminum products is carried out as a part of the inert gases.Often this gas is argon, more rarely, but it is much preferable to helium.This gas due to its thermal conductivity, which determines the temperature of the weld pool, especially the need to weld large krupnostennyh aluminum products has been carried out.Shielding gases help to reduce the formation of pores, due to the complete gas emission.

MIG-welding

1. welding machine.Standard unit is doubtful suitable for aluminum, which is better to use a pulsed-arc machine, which even provides the function of "aluminum".
2. pulsed arc welding.These devices have different programs for different welding materials.If you can choose any other program using the hand controller.menu buttons help you select the desired power and amperage.All other functions are automatically detected.
3. Production wire.It is much softer and more pliable than so that is made of steel.For the wire used chetyrehrolikovoe device, which clamping force is distributed on all rollers.These rollers feed aluminum wire, have the shape of horseshoes «U», which allows to protect the coating of the wire from damage.
4. welding burner.Guides in the wire feed for the burner is a Teflon tube, which reduces the abrasion of the wire.Its thickness should be no greater than 0.8 mm, but if it is, then use Push-pull gun.This burner increases the length of the hose up to ten meters.
5. burner placement.During welding torch is located at an angle of 10-20 degrees vertically from the parts.The distance between the elements and the burner as 10-20 mm.As the distance increases as the gas pressure to protect the weld pool.
6. Four-welding cycle.Basically it aids pulsed arc functions have 4 cycles.The first clock alerts the current pulse, which energy concentration greater than that of welding.Last time in this heat accelerates the edges of all the components of the product.Chetyrehtaktovy cycle does not help to make a lot of mistakes at the beginning of the work.To avoid the appearance of cracks crystallization helps decrease the programmed welding current power at the 4th cycle, it allows closure of the crater.2nd and 3rd cycles - the main welding.
7. Interpuls process.Welding of aluminum has another advantage - it interpuls method that allows you to do the same seam as during TIG-welding.The advantages of the method is considered to be an excellent weld quality and even looks a little heat seam, reducing the various strains.

Welding TIG

1. welding machine.Running AC.In the presence of a large selection of high-power and amperage 170-600 amperes.
2. burners.Mounted vertically at an angle of 15-20 degrees.All the elements for accession are fed into the welding bath at an angle of 10-30 degrees.
3. shielding gas.It should be used from 5 to 12 liters / min based on the burner nozzle diameter.After welding gas must still be in the weld pool, and protect the weld electrode cooling.