Evaluation of the TIG–MIG/MAG welding process in direct polarity

Abstract

The associations of tungsten inert gas (TIG) and metal inert gas/metal active gas (MIG/MAG) welding process intends to take advantage of the higher productivity of the MIG/MAG process with the greater heat control imposed by the TIG process. In this context, the present study aims to evaluate the effects of the TIG-MIG/MAG process with both electrodes in direct (negative) polarity in weld bead geometry. A pioneering research on TIG-MIG/MAG process was carried out for the purpose of writing this article. Therefore, weld beads were made by the conventional MIG/MAG process and by the TIG-MIG/MAG process. Two input parameters, the MIG/MAG polarity and the TIG current, were evaluated. The output responses such as bead width, reinforcement, penetration, melted area, and convexity angles were evaluated. Macrographs were performed to measure the geometrical parameters of the weld bead. The results of these measurements were evaluated by a variance analysis. The results show that the polarity variation has an influence to modify the weld bead geometry in a TIG-MIG/MAG welding process. It was also noticed that the insertion of TIG current caused the tendency to greater wettability, penetration, melted area, width, and smaller reinforcements of weld beads.

Control of droplet transfer using a filler-wire in tandem arc welding

“…In the T-side condition, compared to the tandem process, the bead width was slightly increased, and the bead height was greatly increased, resulting in larger convexity. The excessively convex weldments cause defects due to stress concentration, resulting in poor welding quality [11, 12]. In addition, as described previously, when a high current of 120 A is applied to the filler-wire under the L-side and T-side conditions, the electromagnetic force in the space inside the tandem electrode increases and arc blow occurs in the opposite direction of the travel angle.…”

Welding Order and Welding Penetration Levels’ Impact on Product Life Cycle For GMAW

“…These parameters can be categorized as consumables (welding wire, gas), power source parameters (wire speed, voltage...), robot trajectory (travel speed, position of the arc impact, torch angles, etc. ), which can be seen in Figure 2 [6]. Welding sequence is another parameter that cannot be shown in a diagram; however, that needs to be mentioned since it will be one of the parameters that will be focused on in this paper along with welding penetration level.…”

Numerical Simulation of Arc and Droplet Behaviors in TIG-MIG Hybrid Welding

“…Many studies have shown that tungsten inert gas-metal inert gas hybrid welding (TIG-MIG) is an effective way to combine the respective advantages of single-MIG and single-TIG methods, including high welding efficiency and easy automation for MIG and easy operation and good quality for TIG. This hybrid welding method also has the ability to compensate for shortcomings related to MIG arc instability and low TIG welding efficiency [ 1 , 2 , 3 , 4 , 5 ]. Thus, the synergic effect of “1 + 1 > 2” appears under appropriate hybrid welding parameters.…”