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

Miha Kenda (Author), Damjan Klobčar (Author), Aleš Nagode (Author), Drago Bračun (Author)

Abstract

An 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.

Keywords

two-beam laser welding;continuous-wave;solidification cracking;weld termination regime;ramp-down;lap joint;17-4 PH steel;Inconel 602;

Data

Language:	English
Year of publishing:	2021
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	621.791.725
COBISS:	69793539
ISSN:	1350-6307
Views:	343
Downloads:	91
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	lasersko varjenje z dvojnim žerkom;kontinuirno varjenje;razpoke v vročem;zaključevanje laserskih zvarov;zaključna rampa;prekrovni spoj;17-4 PH;Inconel 602;
Type (COBISS):	Article
Pages:	str. 1-14
Issue:	ǂVol. ǂ128
Chronology:	Oct. 2021
DOI:	10.1016/j.engfailanal.2021.105579
ID:	13119802