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. The Cracking dis-cussed here is the result of solidification, cooling, and thestresses that develop due to weld shrinkage.

A buttering layer of weld material (Figure 2), deposited by a low energy process such as shielded metal arc weld-ing, may effectively reduce the amount of pick-up of contaminant into the weld admixture. In the case of sulfur, it is possible to overcome the harm-ful effects of iron sulfides by preferentially forming man-ganese sulfide.

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  Electric, Weld, Lincoln, Lincoln electric, Cracking, Weld cracking, Arc weld ing

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