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Old 28 February 2012, 12:37   #1
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Welding Stainless Steel?

Hi, I've never welded before but I've seen it done several times, I have access to quite a large SIP 240 Mig welder which is connected to a large cylinder that says argonsheild universal on it.

I guess to weld Stainless I will need to change the wire from the 0.8 wire in there to stainless steel and on the SIP website it's 0.7 so I'll need to change the nozzle too???

Can anyone give me any tips and also any ideas where I can find some offcuts to practice with such as pipe and plate.

Thanks in advance.

Alex
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Old 28 February 2012, 12:45   #2
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Sorry I made a mistake the SS wire is also 0.8 so the nozzle should be ok.
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Old 28 February 2012, 12:51   #3
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Mig welding stainless won't give the nice looking welds you see on people's a frames etc, that's done with a tig.

If you did want to weld ss with your mig you'll need to buy ss wire, 0.8mm is ok for light/medium fabrication and a contact tip of the same size. Gas needs to be changed to pureshield, universal is for carbon steels.

Cutting, drilling, bending etc of ss is a pita requiring lots of heavy duty tools, there's a lot more to it than just wire and gas. Then there's all the polishing kit as well.

My advice is think hard about how deep in you want to go before spending any money.
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Old 28 February 2012, 14:47   #4
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Hi Martini, thanks for the info

Yep I am defiantly sold on the idea of learning how to weld stainless steel and I have just looked at the tig welding method and I am confident that I can do it.

Fortunately I also have access to cutting, drilling and bending equipment but sadly no polishing tools here

I am all up for buying a tig welder so if anyone can recommend one it would be much appreciated

The main use will be to build an a-frame and winged seat backs etc....
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Old 28 February 2012, 15:24   #5
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I can recommend a British manufacturer called R-Tech, very nice quality kit, prices are good and they're very knowledgable and helpful.

They have a website and also sell on eBay.

A DC only inverter is all you need, AC output is for welding aluminium, much more complicated and expensive!

Just make sure it has a high frequency start, not scratch start (quite rare these days anyway)

Their bottom of the range 160A would be more than capable for what you propose, tbh you could get away with something smaller and cheaper
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Old 28 February 2012, 16:11   #6
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New Arc. Brit firm based in NE with Cheryl Cole on reception.

Well built kit, great people to deal with.
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Old 28 February 2012, 16:34   #7
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Originally Posted by whisper View Post
Hi Martini, thanks for the info

Yep I am defiantly sold on the idea of learning how to weld stainless steel and I have just looked at the tig welding method and I am confident that I can do it.

Fortunately I also have access to cutting, drilling and bending equipment but sadly no polishing tools here

I am all up for buying a tig welder so if anyone can recommend one it would be much appreciated

The main use will be to build an a-frame and winged seat backs etc....
Make sure you've got plenty of scrap to practice on. You'll make a lot of failed attempts to start with.

Give me a bell if you want to learn.
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Old 29 February 2012, 17:38   #8
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Thanks for all the info and thanks for the chat tonight Nos

Just a couple more questions.....

What pipe bender would I need to bend tube for seats and an A-frame?

Also with regards to polishing I was planning on pickling the welds after, however the cost of the equipment may be to much for occasional use?

I can now see how the costs can over weigh the advantages of doing it yourself even though it would be very rewarding....
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Old 29 February 2012, 17:56   #9
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New Arc. Brit firm based in NE with Cheryl Cole on reception.
Perving is still alive and well in welding .....
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Old 29 February 2012, 17:58   #10
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Welders use an acid called 'pickle paste' to clean the welds - not expensive, but a jar will probably last you forever as a DIY user!

You can use a conduit bender on 1" OD tube for the backrests, but it's hard work and you (& the equipment) will struggle to do a full 180 deg backrest hoop. A hydraulic tube bender would be best, but lots of money unless you can 'steal' one at a plant/tool sale.
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