Abstract
Solidification cracking is one of the important problems on high-efficiency narrow-gap welding using the thick Ni-base alloy plate. It is generally said that the bead shape as the ratio of its depth and width (D/W) affects largely on solidification cracking, and the large D/W induces solidification cracking. In this research, the new indicator of the delta W, which is the difference between the maximum and minimum penetration depth, was proposed, and it was found that the delta W is correlated to solidification cracking. In addition, the sound bead without solidification cracking could be achieved by realizing the small delta W under the high efficiency (large D/W) using the optimized conditions for hot-wire laser welding.
