02GF74 Posted November 11, 2005 Share Posted November 11, 2005 folks - how thick a piece of mild stell will a TIG 125 A and 100 A welders weld. If from memory 140 A MIG will weld 4 mm so these TIGs will do 3 mm? ta. Quote Link to comment Share on other sites More sharing options...
dollythelw Posted November 11, 2005 Share Posted November 11, 2005 'pends on the weld prep and weld type Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted November 11, 2005 Share Posted November 11, 2005 Yep, and also your skill and experience Nige Quote Link to comment Share on other sites More sharing options...
Niall_CSK Posted November 12, 2005 Share Posted November 12, 2005 As above + depends what you are welding, I presume you want it gas tight. If it's a pipe that will have a fluid flow it's best to back gas it - blank one end off but leave some leakage, arrange a second feed of argomix or whatever you are using with a small cock to regulate the flow into the other end which should be sealed. Prep the join down to between 1 - 2 mm with a 0.5 mm gap and weld with very slight slight positive pressure on the internal feed. That is the best method for a single sided weld, i.e. one where you can't get at the inside to run a bead or grind it smooth. I you are doing something thicker you can run another bead over the top with MIG or stick to regain the overall thickness & hence strength. Quote Link to comment Share on other sites More sharing options...
02GF74 Posted November 21, 2005 Author Share Posted November 21, 2005 BTT. I am looking at a 100A and 120A SIP TIG to weld 3mm ali sheet (can't see the need to weld thicker than that) and 2 mm mild steel. For thicker stuff I can use MIG. So question is will 100 A be enough foir my needs? (don't want to spend more on the 120 unless I have to. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted November 21, 2005 Share Posted November 21, 2005 with a small cock to regulate the flow Fnaaaaaar Fnaaaaaar! I'll just get me coat! Les. Quote Link to comment Share on other sites More sharing options...
Niall_CSK Posted November 22, 2005 Share Posted November 22, 2005 (edited) Fnaaaaaar Fnaaaaaar! I'll just get me coat! Les. Walked into that one didn't I I am sure I have said this before. To weld Ally you need an AC or a DC pulse Tig machine. I don't think SIP do a 100A model, closest I can find is this one SIP 05037 Weldmate Inverter there aren't a lot of details but I am pretty sure it's not a pulsed inverter at that price. I think you will be looking at paying at least 1k for an alloy capable one unless you can pick one up second hand. I know that doesn't really answer your question, IMHO 125A should be capable of welding up to 3mm but you had better be pretty handy with the filler rod at that thickness. Edited November 22, 2005 by Niall_CSK Quote Link to comment Share on other sites More sharing options...
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