Effects of arc types on the laser-arc synergic effects of hybrid welding

Abstract

A dimensionless parameter of melting energy increment (ψ) was employed to quantify the synergic effect in laser-arc hybrid welding. The greater of the ψ, the stronger of the synergic effect. The ψ at different welding parameters of laser-tungsten inert gas and laser-metal inert gas hybrid welding was calculated and compared. The former had a stronger synergic effect than the latter because the change range of ψ was far wider than that of the latter, which was -59.3-83.6% and 1-23%, respectively. The differences were discussed according to the electrode mode and the migration behavior of charged particles in the plasmas.

Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding

“…13. It can be seen from Equation 11that the thermal motion speed of charged particles is inversely proportional to the particle mass [38].…”

Laser induced arc dynamics destabilization in laser-arc hybrid welding

“…The impact of these two aspects will be discussed separately below. (1) The electromagnetic impact of metal vapor Some researchers argue that laser-induced metal vapor can form conductive channel and leads a significant effect on arc plasma, such as contraction and attraction [10,11]. To analyze the electromagnetic impact of metal vapor, the current density distribution of single TIG and LTHW are compared in Fig.…”

“…(3) In the mixture-fluid phase region, the mass, momentum and energy equations are [27]: (11) where F m is the external volume force of the weld pool suffered, includes Lorentz force, buoyancy force and Dacy force. The mixture modle is used to treat the solid-liquid interface [28].…”

“…The laser can also improve weld quality [2,7,8]. Hence, it is generally recognized that the arc plasma can be stabilized by laser in the welding [9][10][11].…”