Pulse melting TIG welding, compared to conventional熔化极 TIG welding, offers controlled jet transition at relatively low average currents and wire melting (or feeding) speeds, which is beneficial for achieving full-position welding. The advantages of pulse melting TIG welding include:

(1) Wide current adjustment range, including the range between short-circuit and continuous jet transitions.

(2) Low line energy, intermittent melting and solidification of the weld metal. The weld grain can be refined, the width of the heat-affected zone is small, and the welding deformation is minimal.

(3) Due to the controllability of line energy, wire melting speed, and droplet transition, the weld bead shape is neat, with good penetration and fusion, and uniform depth. For instance, pipes can be welded suspended without burning through (no backing pad needed), resulting in a uniformly shaped weld on the backside.

(4) The welding process is stable with minimal spatter. The arc is less prone to "back burning" the electrode holder.

(5) Thicker welding wire can be used to enhance the stability of wire feeding.

(6) The average welding current density is low, which helps to avoid the tendency of porosity during the transition of continuous jet flow under high current density.

The welding method known as gas tungsten arc welding (GTAW), which utilizes a molten electrode, an external gas as the arc medium, and protects the molten metal droplets, weld pool, and the high-temperature metal in the welding zone.

Based on the wire material and the shielding gas used, it can be divided into several methods.

Welding wires can be categorized into solid wire welding and flux-cored wire welding.

The welding method using solid-core welding wire and inert gas (Ar or He) to protect the electric arc is known as Gas Tungsten Arc Welding (GTAW), commonly abbreviated as MIG welding.tal Inert Gas Arc Welding):

Solid-core wire argon-rich gas shielded metal arc welding, commonly referred to as MAG welding.tal Active Gas Arc Welding)。

CO2 gas-shielded metal arc welding using solid-core welding wire, including pure CO2 or CO2 + O2 mixed gas, is commonly referred to as CO2 welding.

When using flux-cored welding wire, the arc welding process that utilizes CO2 or a CO2-Ar gas mixture as the shielding gas is called flux-cored gas shielded arc welding. Alternatively, welding can be performed without any shielding gas, which is known as self-protective arc welding.