Transcription of Weld Cracking - Lincoln Electric
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Weld Cracking - Lincoln Electric
weld CrackingAn Excerpt from The Fabricators' and Erectors'Guide to Welded Steel ConstructionThe James F. Lincoln Arc Welding Foundation1 weld CrackingSeveral types of discontinuities may occur in welds orheat affected zones. Welds may contain porosity, slaginclusions or cracks. Of the three, cracks are by far themost detrimental. Whereas there are acceptable limitsfor slag inclusions and porosity in welds, cracks arenever acceptable. Cracks in a weld , or in the vicinity ofa weld , indicate that one or more problems exist thatmust be addressed. A careful analysis of crack charac-teristics will make it possible to determine the cause andtake appropriate corrective the purposes of this section, Cracking will be dis-tinguished from weld failure. Welds may fail due toover-load, underdesign, or fatigue.
weld solidification process. Low melting point compo-nents in the molten metal will be forced to the center of the joint during solidification, since they are the last to solidify and the weld tends to separate as the solidified metal contracts away from the center region containing the low melting point constituents.
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