Lap Joint on TIG/Tungsten Inert Gas Welding

Lap Joint on TIG/Tungsten Inert Gas Welding

Lap Joint on TIG/Tungsten Inert Gas Welding are typically same like fillet joints. The torch angled towards the welding joint around 40 degrees from tilt angle(vertical), and about 20 degrees from slope angle(vertical towards the direction of travel). The tungsten is aimed at the bottom sheet material slightly away from the corner joint.

Lap Joint on TIG/Tungsten Inert Gas Welding are much easier on 3mm or thicker steel material.

The two sheets materials need to be clamped together to allow heat from the top sheet material to dissipate in the bottom sheet material. Otherwise the top sheet edge will burn away.

To help prevent the top sheet from melting back reducing welding amps.

The differences between Lap Joint on TIG/Tungsten Inert Gas Welding and fillet joint technique are aimed at reducing heat in the overlapping plate where there is less steel to dissipate heat and increasing the heat in the lower plate. The welding torch is aimed slightly more towards the lower sheet, the tungsten is aimed onto the lower sheet material a small distance from the corner joint, and the welding amps are a lot lower than a fillet joint.

reference: www.mig-welding.co.uk