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Explanation: Though I agree with mk-lab in general I would use resistance welding instead of contact welding, since that is the term used. The Slovar-Spravochnik po Svarke gives:Kontaktnaya svarka, svarka soprotivleniem, elektricheskaya kontaktnaya svakra, elektrokontaktnaya svarka - raznovidnosti svarka davleniem.
There is a contact welding but that's a special case. See below.
Electric resistance welding at a glance
... welding (ERW). It dicusses high-frequency ERW (contact and induction)
and rotary wheel contact welding (AC, DC, and square wave). It ... www.thefabricator.com/xp/Fabricator/ Articles/Tube/Tub02/02web438.xml - 44k
I'm not sure if this is really fair, as mk_lab has done most of the translating of the phrase, but it was really the 'kontaknoy svarki' part I was most concerned with, and that seems the most useful part to put into the glossary. Not for the first time, I think it would be much fairer if I could split the points, but mk_lab will have to make do with my thanks and sincere apologies. 4 KudoZ points were awarded for this answer