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

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

Povzetek

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.

Ključne besede

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

Podatki

Jezik:	Angleški jezik
Leto izida:	2021
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	621.791.725
COBISS:	69793539
ISSN:	1350-6307
Št. ogledov:	343
Št. prenosov:	91
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	lasersko varjenje z dvojnim žerkom;kontinuirno varjenje;razpoke v vročem;zaključevanje laserskih zvarov;zaključna rampa;prekrovni spoj;17-4 PH;Inconel 602;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1-14
Zvezek:	ǂVol. ǂ128
Čas izdaje:	Oct. 2021
DOI:	10.1016/j.engfailanal.2021.105579
ID:	13119802