This process is similar to both steel and aluminum. Direct current electrode negative GTAW is employed, root face become thicker and grooves very much narrow. It is avoidable in any case, the welding a lap joint. Small continuous filler suitably weld on both sides of the joint is preferable in this case. About 10mm thick materials which can be sheared to a well defined and cut square edge is used. It is cleaned well. Design ambiguities will lead to lapping of material on prepared edges that can trap lubricant. But this may result in weld porosity.
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