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how to weld guide
Aluminum Welding
The
weldability of aluminum alloys varies significantly, depending on the
chemical composition of the alloy used. Aluminum alloys are susceptible
to hot cracking, and to combat the problem, welders increase the
welding speed to lower the heat input. Preheating reduces the
temperature gradient across the weld zone and thus helps reduce hot
cracking, but it can reduce the mechanical properties of the base
material and should not
be used when the base material is restrained.
The design of the joint can be changed as well, and a more compatible
filler alloy can be selected to decrease the likelihood of hot
cracking. Aluminum alloys should also be cleaned prior to welding, with
the goal of removing all oxides, oils, and loose particles from the
surface to be welded. This is especially important because of an
aluminum weld's susceptibility to porosity due to hydrogen and dross
due to oxygen.
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Heat_affected_zone
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History of Welding
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Gas Welding
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