Numerical Simulation of MIG Weld Pool in Switch Back Welding

The Effect of Switchback Parameters on Root Pass Formation of Butt Welds with Variable Gap

“…This improvement was clearer when the backward stroke length was more than half of the forward stroke length. Using thermography on the back of the plate, the authors suggested that the heat tends to penetrate into the plate less when switchback is applied, following the same trend observed in the simulations of Kaneko et al [5,6].…”

“…On the other hand, based on results from elsewhere, improvements could be made through slight adjustments of the switchback parameters. According to the simulations carried out by Kaneko et al [5,6], also in thin plate butt welding, and the results obtained by Schwedersky et al [14], using GTAW at high currents, if the backward stroke length became longer than half of the forward stroke length (B > F/2), continuous root passes could be obtained. In the present cases, the only condition that fulfilled this setting (B > F/2) was the 1SB experiment.…”

“…Further simulation studies on the switchback technique were realized by Kaneko et al [5,6] in butt joints with thin plates. Heat conduction analysis was carried out to investigate the effect of the travel speed, as well as the backward stroke length of the torch on the weld pool.…”

Efeitos do comprimento de reversão e do ângulo de ataque sobre a estrutura de solidificação do cordão em soldagem MIG/MAG com "Switch Back"

“…Outros trabalhos [2,3,4] investigaram o potencial desta técnica no controle da raiz da solda na soldagem MIG/MAG em corrente pulsada de juntas de topo sem a utilização de cobrejunta. Kaneko et al [2], na união de chapas de aço de 3,2 mm de espessura posicionadas em topo, verificaram que o uso da técnica permitiu o controle da raiz da solda em relação a soldagem MIG convencional.…”

“…Kaneko et al [2], na união de chapas de aço de 3,2 mm de espessura posicionadas em topo, verificaram que o uso da técnica permitiu o controle da raiz da solda em relação a soldagem MIG convencional. Este controle cresceu quando utilizou-se maior nível de velocidade de soldagem durante o avanço da tocha em relação a reversão.…”