To minimize susceptibility of transverse cracks cosider:Īs mentioned above, the most important tool to prevent cracks is a welding procedure specification that has been qualified by testing. The most common causes for this type of crack are: excess hydrogen, high residual stress levels on the weld, and high carbon content on the base material. A HAZ crack can originate at the toes of the weld or a few millimeters from the weld altogether. The heat affect zone (HAZ) of a weld is not limited to the weld itself but to the immediate area of parent material surrounding the weld. Lets look at the most common types of cracks, their possible causes, and how to prevent them. With this being said, we should not follow a WPS blindly, if there is something we believe is not right we must bring it up to our supervisor’s attention. The use of WPS is not simply to comply with an internal or customer requirement, it is to insure quality. Probably the single, most important tool for preventing cracks is the Welding Procedure Specification (WPS). Welds can fail due to design flaws, but the majority of weld failures occur due to reasons we as welders can prevent. Unfortunately, weld failures can cause injury. Hopefully the consequences are limited to time and money. Whether a weld cracks on a truck’s axle or on the post holding your house’s fence, there are always consequences.
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