Posted by admin on Monday, July 27, 2009 · Leave a Comment
Yes it does, by dilution or admixture of the base metal into the weld puddle. The way to reduce dilution is to increase current and increase travel speed within acceptable limits of course. Traveling too fast causes lack-of-fusion, poor bead appearance, and slag entrapment.. Using too much current causes porosity, undercut, excessive spatter, and poor arc performance. it also result in burn-through on thinner materials.
Note: Hard facing should generally be done in the flat or horizontal positions if at all possible.
Dilution happens with all welds. It's generally not an issue with hardfacing materials as dilution is taken into account when they're designed. Dilution is the greatest around the line of fusion with the base metal, not on the surface of the weld where the greatest wear resistance is needed. In this sense dilution is beneficial to the weld, as the zone of fusion is made softer, tougher, less brittle, and more crack resistant.
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