Effect of applying electrical potential to a CO₂ laser welding of different thickness plates

Abstract

This study was aimed at developing laser welding with an applied voltage potential to increase the bead root width in laser welding. Also, in order to enhance the welding speed and the butt joint gap tolerance, the influences of the experimental conditions: supplied voltage between plate and backside electrode, welding speed, plasma operate gaseous species, and the butt joint gap, on the bead root width were investigated. Although it is necessary to avoid over heating and melting the plates, it is applicable for higher speed and wider gap butt joint welding than a conventional laser welding. In the case of butt joint welding with a thickness of 2.0 and 0.8 mm steel sheets by using 5 kW CO 2 laser system, it is concluded that this method is effective for increasing of the welding speed from 5 to 8 m/min. Knowledge of optimum conditions and configurations has guided to extend this process to more challenging structural materials such as a tailored blank steel sheet. q

The Wave Motion of the Rolling Force during Variable Gauge Rolling

“…LP plates have advantages, such as weight savings, welds in areas with less load, fewer welded joints (as shown in Figure ), the avoidance of expensive bolted joints, and savings in the cost of fabrication, lower maintenance costs, and optimizing the matching of steel cross section to actual stresses. TRBs are used instead of the tailor welded blanks (TWB) to manufacture automobiles, and when compared to TWB, TRB has advantages such as without a sudden change in thickness making special demands on mold due to a welding seam, improvement of safety, good energy absorption in the transition region.…”

Numerical investigation of the effect of driving forces on the weld pool convection and thermal stress in a GTAW process

“…The electric potential problem is solved by applying a steady state analysis as the welding intensity is obtained practically after the applying of the electric arc [19].…”

A Literature Review on CO2 Laser Welding

“…Welding speed is the parameter that most significantly influences the weld bead dimensions. Hamatani et al (2005) studied the CO 2 laser welding of mild steel SS45 with a thickness of 0.8, 2.0, or 3.2 mm with TIG used for applying the voltage potential to increase the bead root width. It was also investigated enhancement of the welding speed and the butt joint gap tolerance and the influences of the experimental conditions such as: supplied voltage between plates and backside electrode, welding speed, plasma operates gaseous species, and the butt joint gap on the bead root.…”