What is the installation method of welding wire for secondary welding?

Left welding method (right → left): the residual height is small, the width is large, the splash is small, the weld seam is easy to observe, the welding process is stable, the gas protection effect is good (the left welding method must be used for non-ferrous metals), but the dissolution depth is shallow.

Right welding method (left → right): residual height, small width, large splash, easy to observe the molten pool and deep melting.

Gun transport mode: zigzag swing grab.

Flat angle welding does not swing or slightly swing.

The vertical angle is welded upwards and transported by triangular welding torch.

Welding gun transition: stop at both sides of the molten pool and transition at 1/3 in front of the molten pool.

Angle of welding gun: perpendicular to the weld, making an angle of 80-90 with the conveying direction of welding gun.

Test plate: the gap is 2.0-2.5 mm, and the arc starting point is slightly smaller than the arc closing point. No blunt edge, reverse deformation 1.

Prevent defects in advance: prevent the included angle from melting-burning through. Anti-interlaminar fusion-pay attention to the angle of the gun.

The second kind of welding wire, also called carbon dioxide gas shielded welding wire, is a kind of welding wire specially used for carbon dioxide gas shielded welding. Usually coiled, it is convenient for mechanization and automation.

Welding wire material for secondary shielded welding: blowholes and splashes are easy to occur during secondary shielded welding, resulting in insufficient strength of welded joints. In order to prevent these defects and ensure the mechanical properties of the weld, it is required that the welding wire contains enough alloying elements, such as silicon and manganese, to deoxidize the joint, and the carbon content is below 0.65438 0%.

The relationship between welding wire diameter and current and voltage;

Welding wires with different diameters correspond to different currents and voltages.

φ 1.2 Relationship between welding wire and current and voltage;

φ 1.2 secondary welding wire, corresponding to welding current and voltage parameters with different thickness.