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.
The final mechanism that generates centerline cracks is surface profile conditions. When concave weld sur-faces are created, internal shrinkage stresses will place the weld metal on the surface into tension. Conversely, when convex weld surfaces are created, the internal shrinkage forces will pull the surface into compression.
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