tig welding threaded rod into a blind hole

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so im tig welding threaded rod into a tapped blind hole.  how to I prevent the air pocket that pops when I get to the last little bit of weld??
Reply:Hello RodKnockin, is this hole completely void of tapping fluids, oils, and any other types of contamination. Any of these items will cause/contribute to your closure of the weld bead due to the off-gassing that is occurring through the heating of these compounds during welding. So if you can clean these holes meticulously that may very well be the answer to your problem. Short of that, welding up to the point where you are just about to reach closure and then setting the piece aside until it has cooled considerably before you complete the weld may be the answer. If you have multiples of these parts, try to weld as I described, set it aside and do the same with others and then go back through the stack to finish them. Best of luck and regards, Allanaevald
Reply:Do you mean it was a through hole, and now you are welding the back side shut?Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Hello Dave, I do believe that he is welding a threaded rod/stud into a tapped hole with a bottom, but I could certainly be wrong. Regards, Allanaevald
Reply:Aevald nailed it!!!
Reply:I see now - didn't occur to me that someone would thread it in, and then weld the threads.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Letting it cool did the trick, thanks guys.  Yeah its a knob that the customer specified a close dimension so its easier to thread in till that measurement is on and blaze away.
Reply:Glad to hear that you got it worked out. Regards, Allanaevald