Table 10-4.--Causes and Cures of Common Welding Problems
Aluminum conducts heat three times faster than
there is no color change in aluminum during
heating. However, it is possible to know when the
iron, so you need a higher heat input to weld the
aluminum is near its melting point and at welding
aluminum. On the other hand, copper has a higher
thermal conductivity than aluminum; therefore, less
temperature by watching the weld pool. The GTA
w e l d pool, for example, develops a glossy
heat is required to weld aluminum than copper. It
appearance, and a liquid pool or spot forms under
is usually helpful to preheat heavy sections of
the arc when the metal becomes molten.
aluminum to reduce heat loss and, when using the
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