Quote:
Originally Posted by Sieg
Created a project to get some heavy gauge practice on. The heavy stuff was good for me and my aging eyes as it's like looking at the puddle under a microscope. 
Final pass using 3/32 lay-wire and weave pattern with the torch.
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From your picture it looks like your tungsten could be sharper. Plus that will concentrate you heat more. Your probably finding the thicker material easier to see because your using more amperage and lighting up your welding shield better. On thinner material you might go to a lighter lense. The problem with the thicker material is it welded totally different. You can run a lot more heat and not work on the the most important part of welding. Controlling your heat. I hire industrial welders that are certified for thick metal projects but cannot control there heat to save their life or their job.
When you do a welding cert job you might do the tubing test we did for a big Stainless job we do monthly for a local company. We welded .25 wall material tubing. The cut the small joint maybe 4 inch long and cut it it to 6-8 strips length wise so you can see the penetration from the middle. There can be penetration on both sides that has a huge void in the middle. We learned that on some Xray-ed parts we did for the same company.
These are some parts we are welding up today. They are huge and require multiple passes for proper penetration.