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

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

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.

• Language: English
• Keywords: two-beam laser welding, continuous-wave, solidification cracking, weld termination regime, ramp-down, lap joint, 17–4 PH steel, Inconel 602
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering; NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 14 str.
• Numbering: Vol. 128, art. 105579
• PID: 20.500.12556/RUL-128354
• UDC: 621.791.725
• ISSN on article: 1350-6307
• DOI: 10.1016/j.engfailanal.2021.105579
• COBISS.SI-ID: 69793539
• Publication date in RUL: 09.07.2021

Record is a part of a journal

• Title: Engineering failure analysis
• Shortened title: Eng fail. anal.
• Publisher: Elsevier
• ISSN: 1350-6307
• COBISS.SI-ID: 15354117

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: lasersko varjenje z dvojnim žarkom, kontinuirno varjenje, razpoke v vročem, zaključevanje laserskih zvarov, zaključna rampa, prekrovni spoj, 17-4 PH, Inconel 602

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Hidria Holding d.o.o.

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0270
• Name: Proizvodni sistemi, laserske tehnologije in spajanje materialov