Remote fibre laser welding of advanced high strength martensitic steel

Prijanovič, Urban (author), Tonkovič-Prijanovič, Marica (author), Trdan, Uroš (author), Pleterski, Matej (author), Jezeršek, Matija (author), Klobčar, Damjan (author)

The study presents the results of remote robotic laser welding of advanced high strength Docol$^®$ 1200 M martensitic steel. One mm thick samples were welded in a lap joint configuration using a special clamping system. Welding was done using a continuous-wave (CW) fibre laser with a constant welding power of 300 W and constant focus diameter Ø 1.8 mm. Welding was done using 12 different welding speeds in the range from 0.15 to 1 m/min, whereas the inclination angle was kept constant at 0°. The influence of various welding speeds and linear heat inputs during welding on microstructural changes were examined by the occurrence of acicular and allotriomorphic ferrite or martensite. Results revealed big influence of the clamping system on the accumulation of the laser beam energy, heat sink and consequently weld size and geometry, as well as its microstructure and joint strength. Tensile-shear strength, microstructure and hardness results confirmed laser power of 300 W and 0.6 m/min welding speed as the optimal parameters, at which a martensitic structure was obtained in the weld. The width of the heat affected zone (HAZ) in this case is 1100 µm.

• Language: English
• Keywords: advanced high-strength steel, laser welding, automotive industry, tensile-shear strength, hardness, heat affected zone (HAZ), microstructure
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 14 str.
• Numbering: Vol. 10, iss. 4, art. 533
• PID: 20.500.12556/RUL-127261
• UDC: 621.791.725+620.17(045)
• ISSN on article: 2075-4701
• DOI: 10.3390/met10040533
• COBISS.SI-ID: 17165571
• Publication date in RUL: 31.05.2021

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

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.
• Licensing start date: 20.04.2020

Secondary language

• Language: Slovenian
• Keywords: napredna visokotrdna jekla, lasersko varjenje, avtomobilska industrija, natezno-strižni test, trdota, toplotno vplivana cona, mikrostruktura