Brazing of high-strength steels: Recent developments and challenges

Singh, Jaivindra; Khan, Muhammad Shehryar; Oliveira, J.P.; Arora, Kanwer Singh

doi:10.1016/j.jmapro.2024.02.011

Cited by 5 publications

(1 citation statement)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zinc-coated steel sheets [1], widely utilized as automotive materials, have consistently seen an increasing adoption rate compared to non-coated steel sheets [2]. However, the application of zinc-coated steel sheets has been accompanied by challenges during welding due to their significantly lower melting and vaporization temperatures of the zinc layer compared to steel sheets, resulting in welding defects such as blow holes and pits [3][4][5][6][7]. This issue arises from the formation and growth of porosities within the molten pool caused by zinc vapor [8][9][10][11], and various methods have been continuously devised to prevent such welding defects [10,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The Pre-Heating Effect for Porosity Control during the Laser Welding of Galvanized Steel Sheets

Bang,

Kim,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Recently, for the high performance of automobiles, the application ratio of zinc-coated steel sheets with excellent corrosion resistance has been increasing. However, it is difficult to achieve sound welds, as porosities form from zinc during welding. In this study, a laser welding process, with the addition of a pretreatment step to conventional laser welding, was devised to improve weld quality by eliminating pores caused by zinc in the welds. Laser welding was performed on the overlapping joint of hot-dip galvanized steel sheets (SGARC 340, Hyundai Steel., Suncheon-Si, Jeollanam-do, Republic of Korea), with a thickness of 1.2 mm in the upper sheet and 0.9 mm in the lower sheet, and the welding characteristics were investigated by varying the laser power and focal position. Compared to conventional laser welding, the three-step laser stitch welding process significantly reduced the degree of spatter generation and welding defects. Additionally, it increased the tensile–shear load by approximately 37%. Moreover, the reduction in the zinc component of the three-step laser stitch welds was confirmed through SEM-EDS analysis. These findings contribute valuable information for securing high-quality welding joints and effectively addressing zinc-coated steel sheet welding quality issues in the automotive and industrial sectors.

show abstract