Tig 102

[SuperB70]

Now I want to get in and give my .02

its ok to weld ( fusion) with tig without using any filler but you have to understand that by doing that the metal get poor and thats why you can get those little craters and holes. More better material, more it will happen.

Like it doesnt matter much with normal sheet metal but does matter a lot with aluminium ,stainless or titanium.

By using even mig wire now and then when you weld, you can see that it will restore the metal and it will produse cleaner weld. This is something that you have to practice to get good at it.

For purge you can do as has been told here before or you also can use back purge paste witch is also really good thing to have. or if you can, you can also use a ceramic back support, witch you have get out after welding. They are commonly used in industrial cos they are reuseadle and can be used in small area inside large tanks and so on. And they are way cheapper than gaas flow.

It has been sad about cleaness but also it important to weld with correct size and color tungsten and amp level.

If you have a good a machine, you can paly with pulse, so you can set the welding amp, time and weld/rest ratio.

I'll give an exsample:

I made an overflow tank to Atlas Copco diesel power twin screw air compressor from 0.8mm/0.03" stainless and didnt need to purge it at all. I just search the right settings from my machine amps and pulses wice and it welded it nicelly. It did melt them through but pulce upamps stopped just before it get to sugared. Weld it in inch here, another there all way around and it game out nice. Have to get the pictures out of my shop camera.