Abstract
The transverse-motion weldability (TMW) test was applied to carbon steels, by moving the lower sheet during lap welding at a constant speed V in the transverse direction to induce solidification cracking. A transition range of V (between no cracking at lower V and full cracking at higher V) that occurred at a lower V level indicated a higher susceptibility. The variation in the susceptibility with the carbon content of the steel was related to the Fe–C phase diagram and compared to those shown previously by other tests. The nominal critical strain rate based on the transition range was compared to the critical strain rate based on measurement by in situ observation during welding.
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