Analysis and prevention of weld crater cracking in circumferential laser microwelding of automotive pressure sensors

• Autogenous laser welding produces concave end-crater in 17–4 PH that is prone to solidification cracking. Solidification cracking at weld causes leakage. The use of novel zigzag power ramp-down profile significantly shorter, discontinuous, and leakage free cracks. An analysis presents a problems automotive pressure sensor, caused by crater A two-beam (TBLW) was used circumferential weld, which undesirably increases the probability creating two end craters on single weld. Microstructural showed microsegregation alloying elements combined with imposed strains crater. “zigzag” results limited crack propagation producing shorter discontinuous In such endings no longer an issue.