Analysis and prevention of weld crater cracking in circumferential laser microwelding of automotive pressure sensorsKenda, Miha (Avtor) Klobčar, Damjan (Avtor) Nagode, Aleš (Avtor) Bračun, Drago (Avtor) two-beam laser weldingcontinuous-wavesolidification crackingweld termination regimeramp-downlap joint17–4 PH steelInconel 602An analysis presents a weld leakage problems of automotive pressure sensor, caused by weld crater cracking. A two-beam laser welding (TBLW) was used to weld a circumferential weld, which undesirably increases the probability of weld leakage by creating two weld end craters on a single weld. Microstructural analysis showed that microsegregation of alloying elements combined with imposed strains causes solidification cracking at the weld end crater. A novel "zigzag" laser power ramp-down was used and the results showed a limited crack propagation by producing significantly shorter discontinuous cracks. In such weld crater endings the leakage is no longer an issue.20212021-07-09 11:12:20Članek v reviji128354sl