I'm designing a carbon steel vessel to contain gas at a low pressure. The plan now is to fillet weld a flat, oversized top onto a 24" tube. Material thickness will be between 1/8" and 1/4". It doesn't really matter to me what type of welding is used so long as it is airtight.
I'm trying to estimate welding manhours for a design and I was wondering if there are any resources on the web that would help me. A rule of thumb would do, but also I want to know which welding processes take longer than others.