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TIG Parts Explained | What goes where on a TIG welding torch

If TIG welding is not something you do all day every day, making sense of torch parts can be a challenge. In this article, we give you a breakdown diagram to show what goes where, with further details on each part in the table below.

While the parts shown suit #17, #18 & #26 series TIG torches (which are the most widely used and commonly available), the general structure of all TIG torches is similiar.

For further helpful content, see also:
Weldclass TIG Torches & Spares Catalogue (pdf download)
The TIG Welding Process - your questions answered

TIG Torch Parts Breakdown

Refer to table below for description & purpose of each part, and links to more information.

Weldclass Parts to suit 17/18/26 TIG Torches 

Click on any image to view more information.

Ref	Item / Purpose	Size / Details	Click on image for more info ↓	Part No
T	Tungsten Electrode Conducts welding current & creates the arc	Handy Pack 1.6+2.4mm		WC-06509
		1.6mm "All Metal" Pk10		WC-05192
		2.4mm "All Metal" Pk10		WC-05193
		3.2mm "All Metal" Pk10		WC-05194
A	Back Cap Shields back of tungsten electrode	Long Pk2		WC-57Y02P
		Medium Pk2		WC-57Y05P
		Short Pk2		WC-57Y04P
B	Torch Body Receptacle for & conducts current and gas to consumable parts	17F Flexi no valve		P3-TB17F
		17FV Flexi with valve		P3-TB17FV
		26F Flexi no valve		P3-TB26F
		26FV Flexi with valve		P3-TB26FV
C1	Collet Std Grips tungsten electrode	1.6mm Pk2		P3-10N23
		2.4mm Pk2		P3-10N24
		3.2mm Pk2		P3-10N25
C2	Wedge* Collet Std Grips tungsten electrode	1.6mm Pk2		WC-01843
		2.4mm Pk2		WC-01844
		3.2mm Pk2		WC-01845
C3	Wedge* Collet Stubby Grips tungsten electrode	1.6mm Pk2		WC-01840
		2.4mm Pk2		WC-01841
		3.2mm Pk2		WC-01842
	*Wedge collets provide reliable clamping of the tungsten vs standard ‘split’ collets that are prone to twisting when subject to heat / prolonged use
D1	Gasket Provides gas-tight seal	For gas lens Pk2		WC-54N01P
D2		PX Std Pk1		WC-01839
D3		PX Large Pk1		WC-01849
E1	Collet Body Std Clamps against collet & directs gas though the cup	1.6mm Pk2		P3-10N31
		2.4mm Pk2		P3-10N32
		3.2mm Pk2		P3-10N28
E2	Collet Body / Gas Lens* Clamps against collet & directs gas through cup	1.6mm Pk2		WC-45V25P
		2.4mm Pk2		WC-45V26P
		3.2mm Pk2		WC-45V27P
E3	Collet Body / Diffuser Holder Seals top of, & directs gas through glass cup	PX Std Pk1		WC-01846
E4		PX Large Pk1		WC-01847
F1	Diffuser / Gas Lens* Clamps against collet & 'filters' gas for uniform & smooth flow	PX Std 1.6mm Pk1		WC-01833
		PX Std 2.4mm Pk1		WC-01834
		PX Std 3.2mm Pk1		WC-01835
		PX Large 1.6mm Pk1		WC-01836
		PX Large 2.4mm Pk1		WC-01837
		PX Large 3.2mm Pk1		WC-01838
	*Gas lens parts incorporate a fine mesh gas filter for low-turbulence & smooth, linear gas flow to improve weld quality and allow longer tungsten stick-out
G1	Ceramic Cup Std Directs gas to the weld pool	#05 7.9mm Pk2		P3-10N49
		#06 9.5mm Pk2		P3-10N48
		#07 11.1mm Pk2		P3-10N47
		#08 12.7mm Pk2		P3-10N46
		#10 15.8mm Pk2		P3-10N45
G2	Ceramic Cup For gas lens Directs gas to the weld pool	#6 9.5mm Pk2		WC-54N16P
		#7 11mm Pk2		WC-54N15P
		#8 12.7mm Pk2		WC-54N14P
G3	Glass Cup Directs gas to,  & illuminates / enhances view of, the weld pool	PX Std Ø14mm Pk1		WC-01831
G4		PX Large Ø29mm Pk1		WC-01832
K	Parts Kit  Suits all 17/18/26 series TIG torches	Standard		WC-01660
		Gas Lens Series		WC-01661
		PX Glass Cup Series Std		WC-01662
		PX Glass Cup Series Large		WC-01663