Abstract
The development of automobile steel was analyzed in this paper; it is pointed out that high-strength galvanized steel will be widely used in the car body structure. By analyzing welding problems about the dual phase (DP) series of high-strength galvanized steel, the importance of laser welding was concerned. Finally, laser lap welding process technology of high-strength galvanized steel was studied; the results show that the lap weld with welding process smooth and spatter-free as well as beautiful welding bead surface appearance and good mechanical properties can be made by using the dual-beam laser welding technology and interlayer for welding high-strength galvanized steel.
Highlights
Automotive performance is developing to the direction for lower fuel consumption, safety, and durability
When the sheet thickness is reduced from 1.5 mm to 1.0 mm, the vehicle weight will drop 15–30%; in the present and future for a long time, the development trend of automobile production will be to reduce sheet thickness, which will inevitably lead to increased mechanical properties of steel sheet
Steel sheet thickness decreases to 0.7–1.0 mm, and to ensure good corrosion resistance, they were usually hot dip Galvanized steel sheets and Galvan annealed steel sheets
Summary
Automotive performance is developing to the direction for lower fuel consumption, safety, and durability. Almost no gap between the two faying surfaces, the Zinc vapour does not escape from the faying surface after zinc coating melted and vaporized, only migration and precipitation occur towards the direction of weld; the Zinc will generate secondary evaporation under the thermal effect of high-power laser beam which leads to spattering The process such as Al foil as the interlayer [12]: melting temperature (MT) of Al is 660◦C, the boiling temperature (BT) of Zn is 907◦C, Al’s BT is 2450◦C, so that when Al is melted, Zn is not evaporated and form liquid Al-Zn alloy with liquid Al. When the alloy boiling temperature (BT = 2450×Al% +907×Zn%) is greater than 1500◦C, evaporation of zinc coating can be prevented with no spattering, but the mechanical performance of joint is declined. The purpose of this paper is to ensure good weld corrosion resistance, appearance, and mechanical properties for lap welding of high-strength galvanized steel sheets by using dual beam laser and interlayer process
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