Welding Thickness

Should be the same thickness as the items being welded.

Are you and smathur72 and shebil all taking a welding class?

Download the American Welding Society documents.

FAQ: How do you determine the minimum size of a fillet weld?

The weld should be considerably thicker than a RCH. How much thicker the weld should be depends on what one is welding, the mechanical loads the weld will see, the phase of the moon, the welding technique and many other unspecified attributes.

I see you're from the old school.

OTOH, if you are welding a pipe column to a base plate, non-moment connection, you might get away with less. It depends on such details.

1. What is your design code?

2. Is this for structural application?If so, what kind of load is acting on primary and secondary members (ie, static Load OR Dynamic Load OR Static and Dynamic Loading)?

3. Is this for pressure containing application?If so, what is the pressure and temperature of the service fluid?

4. Is this pipe to pipe weld OR plate to plate OR pipe to plate weld?

5. What is the material of construction? (Allowable stress value is determined based on base material such as ASTM,ASME,EN etc.)

Yes indeed, more information of the application is required. I don't think that we are mind readers.

To paraphrase Albert Einstein, make every weld as thick as possible but not thicker.