From rLab

ThermalArc 202AC/DC TIG Welder

This tool requires induction
Owing to it's dangerous nature, delicate nature, or expense, this tool requires that you be inducted on it's proper handling before use.


ThermalArc 202AC/DC TIG Welder

We have a ThermalArc 202 TIG welder unit that's a high-end TIG welding system capable of currents up to 200A (but currently limited to less, see status) which can weld Steel, Stainless Steel, Aluminum, Magnesium, Copper, Brass, Lead, and a variety of other metals as well as being capable of TIG Brazing and hardface welding. As this is both one of the more expensive tools downstairs and one of the hardest to use induction is required before operating the TIG welder and it's recommended that people learn and practice using the MIG welder before moving on to TIG as MIG is substantially easier to learn and some of the skills will transfer. The TIG welder and it's argon gas bottle are normally kept under the metalworking table and accessories are kept in drawer F3C of the metalwork table.

We ask for the following donation rates from people using the TIG welder

Material Mild Steel Stainless Steel Aluminium Brazing
Price per linear

metre of weld done

(not per wire metre)

£10.00 £20.00 £15.00 £50.00

Current Status[edit]

Date Status Comment
13th October 2021 Fully Functional Limited to 130A by the power connection

The TIG welder has full envelope control on both AC and DC welding as well as HF-Start, Pulse-mode, Wave-Balance and Frequency control, which enables it to weld just about anything that's technically weldable. For simple jobs on mild steel it might be over-kill though and the MIG welder might be a better choice. For especially thick bits or dirty metal it may be better to use the MIG welder in Stick welding mode. If you're not sure of the best welding process for your job Steve's written a short guide that's here

The manual for the TIG welder is here.

The connector for controls has been changed to an RS-PRO 5-pin miniature circular connector (part numbers 1115757 & 1115763) with the following pin-out

Pin Function
1&2 Trigger switch, close to start welding, must be electrically isolated
3 Remote 5K potentiometer, Minimum Setting
4 Remote 5K potentiometer, Wiper
5 Remote 5K potentiometer, Maximum Setting

Planned Upgrades[edit]

Parts and upgrades that are planned/Budgeted/Purchased for in the near future

  • Rewire onto 32Amp mains connection.

TIG Welder Caretakers[edit]


The following people are able to provide inductions on the TIG Welder

Name/Contact Notes


These are the people who look after and repair the TIG welder, they're the ones to contact if there's any problems with it

Name Notes

Recent Changes[edit]

If you make any non-trivial changes to the TIG welder or perform maintenance please note it here, delete records older than 1 yr

  • Gas refilled by Suki Stever (talk) 23:43, 13 October 2021 (BST)
  • Fit new connectors on control lines Stever (talk) 16:58, 14 July 2021 (BST)
  • 50L gas bottle has gone, we're just using the 11L Albee bottles now