Welding procedure for aluminum


Aluminum Welding requires specific welding skills.  Even for folks experienced in welding different steels, the welding of aluminum alloys can present a difficult challenge.  The reason that Aluminum Welding  can be a bit tricky is primarily due to the higher thermal conductivity and low melting point of aluminum alloys.  Unless welders can follow certain procedures, burn through could be the result.  Another factor to pay close attention to is the feeding of the aluminum welding wire.  While performing gas metal arc welding you must be careful because the wire is softer than steel.  The wire also has a lower column strength and has the tendency to tangle at the drive roll.


Aluminum Welding requires the welder to make sure that the base material is clean and remove any aluminum oxide and hydrocarbon contamination due to excess oils or cutting solvents.  If any oxide is left remaining on the surface of the base  material, it will effect the penetration of the filler material into the working piece.  The proper way to remove excess aluminum oxides is to use a stainless steel bristle wire brush or the proper solvents.  Always make sure to brush in one direction only while using the stainless steel brush and do your brushing lightly.


When you are Welding Aluminum it is best to preheat the aluminum workpiece which can help avoid weld cracking.  The proper technique when welding aluminum is to push the welding gun away from the weld puddle as opposed to pulling the gun.  This proper procedure will lend to better cleaning action and reduced weld contamination.

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