Hobart 180 SD Guidelines for TIG Welding Gtaw, Positioning The Torch, Instead of thoriated. Tho

SECTION 8 – GUIDELINES FOR TIG WELDING (GTAW)

8-1. Positioning The Torch

		Y Grinding the tungsten elec-
			trode produces dust and fly-
			ing sparks which can cause
			injury and start fires. Use lo-
			cal exhaust (forced ventila-
	3		tion) at the grinder or wear an
			approved respirator. Read
			MSDS for safety information.
	2		Consider using	cerium or
			lanthanum based tungsten
			instead of thoriated. Tho-
			rium dust contains low-level
		4	radioactive material. Proper-
			ly dispose of grinder dust in
			an environmentally safe way.
			Wear proper face, hand, and
	90°		body protection. Keep flam-
			mables away.
	1	1	Workpiece
		Make sure workpiece is clean
		before welding.
		2	Work Clamp
		Place as close to the weld as
	10–15°	possible.
		3	Torch
	4	4	Filler Rod (If Applicable)
		5	Gas Cup
°	5	6	Tungsten Electrode
	6	Select and prepare		tungsten
10–25
		according to Sections 7-1, and 7-2
		or 7-3.
		Guidelines:

5

6

1/16 in

3/16 in Bottom View Of Gas Cup

The inside diameter of the gas cup should be at least three times the tungsten diameter to provide ade- quate shielding gas coverage. (For example, if tungsten is 1/16 in diameter, gas cup should be a minimum of 3/16 in diameter.

Tungsten extension is the distance the tungsten extends out gas cup of torch.

The tungsten extension should be no greater than the inside diameter of the gas cup.

Arc length is the distance from the tungsten to the workpiece.

Ref. ST-161 892

OM-355 Page 24