| 摘要 |
A process is described in which a weld in Aluminum alloy is produced without cracks and porosity; or, cracks and porosity is reduced to a low acceptable level. Thus, the process eliminates or reduces the need of non-destructive testing and re-work which usually involves gouging the defective area and re-welding to make the same sound and crack free. Porosity in the weld, however, can't be reduced once generated during solidification of the weld; therefore, cooling gradients are applied to the weld by placing a back-up material with sufficient heat-sink capacity and having thermal conductivity higher than the base metal/s, the back-up material having the same width which contacts the projected weld width on the opposite side of weld.
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