Zinc Transport Phenomena in Laser Welding of Coated Sheet Steel in Overlap Configuration

2008 ◽  
Vol 52 (7-8) ◽  
pp. 33-41
Author(s):  
R. R. G. M. Pieters ◽  
C. Goos ◽  
B. Rietman ◽  
I. M. Richardson
Keyword(s):  
Laser Welding ◽  
Transport Phenomena ◽  
Sheet Steel ◽  
Zinc Transport ◽  
Coated Sheet

Nd:YAG laser welding of coated sheet steel

1994 ◽  
Vol 6 (4) ◽  
pp. 212-222 ◽  
Author(s):  
M. P. Graham ◽  
D. M. Hirak ◽  
H. W. Kerr ◽  
D. C. Weckman
Keyword(s):  
Laser Welding ◽  
Nd:Yag Laser ◽  
Sheet Steel ◽  
Coated Sheet

Nd:YAG laser welding of coated sheet steel

1993 ◽  
Author(s):  
M. P. Graham ◽  
D. M. Hirak ◽  
H. W. Kerr ◽  
D. C. Weckman
Keyword(s):  
Laser Welding ◽  
Nd:Yag Laser ◽  
Sheet Steel ◽  
Coated Sheet

WEIRKOTE PLUS

Alloy Digest ◽  
1987 ◽  
Vol 36 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Carbon Steel ◽  
Physical Properties ◽  
Deep Drawing ◽  
Sheet Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Steel Corp ◽  
Coated Sheet

Abstract WEIRKOTE PLUS is a Galfan-coated sheet steel. The sheet is conventional low-carbon steel normally used for galvanized sheets and strip. This digest will concentrate on the characteristics and properties of the Galfan coating which is nominally a 95% zinc-5% aluminum alloy. The coating on Weirkote Plus is ideal for a variety of tough applications. It is excellent for products that require deep drawing and it combines extra corrosion resistance with superior formability. This datasheet provides information on composition and physical properties. It also includes information on corrosion resistance as well as forming, joining, and surface treatment. Filing Code: Zn-41. Producer or source: Weirton Steel Corp.

Mechanism of Zn Vapour Suppressed by Al In Laser Lap Welding of High Strength Zinc Coated Sheet Steel

2010 ◽  
Vol 37-38 ◽  
pp. 634-642 ◽  
Author(s):  
Shi Quan Zhou ◽  
Zhen Guo Peng
Keyword(s):  
Binary Alloy ◽  
Sheet Steel ◽  
Travel Speed ◽  
Laser Fusion ◽  
Single Beam ◽  
Dual Beam ◽  
Beam Method ◽  
Laser Lap Welding ◽  
Lap Welding ◽  
Coated Sheet

The basic feasibility of laser fusion welding for prefabrication and assembly of zinc-coated sheet steel auto body components has been demonstrated in a significant number of prior studies. For trouble-free high volume manufacturing, however, one leading key technical concern remains incompletely resolved. In lap or similar weld joint geometries, venting of trapped Zn vapour can seriously disturb the molten weld pool and give rise to gross fusion defects. In this paper, the technical status of the issue has been reviewed, and various experiments were planned to explore Al foil as an interlayer and dual beam laser for suppressing Zn vapour. The results have shown that the welding processing is very sTable when the lap 1+1 mm sheet steel is welded by using Nd-Yag laser at 3KW power and 4m/min travel speed (defined as single beam) with 75μm Al foil as interlayer. However, if first using 2KW power and 4m/min travel speed, secondly using 3KW power and4m/min travel speed (defined as dual beam), only 25 μm Al foil can stabilize welding fusion pool. It is found that Al foil just store the Zn vapour in the single beam method and cannot mix with Zn to form Al-Zn binary alloy, because the laser heating is too fast that Zn has been vaporized before Al was melted. But Al can mix with Zn to form Al-Zn binary alloy in the dual beam method, therefore, the boiling temperature is raised to about 1600°C. So that, in laser lap welding of Zn coated (galvanized) sheet steel, the Al-Zn alloy will be more effective than Al metal for stabilizing welding process.

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