#11
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depending on the spot weld machine used and diameter of the electrodes a spot weld nugget would be around 5mm to 10mm with a burn ring around 12mm on a 10mm nugget? the material is still being heated to a molten steel temp. just my logical thoughts maybe there is something I don't know and could learn
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Neil |
#12
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Cheers Gav |
#13
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Christopher Rathman Chris' Autobody Restoration Service |
#15
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well there you go i stand corected
Cheers Gav |
#16
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just before welding a quick pass with a hand held spot blaster "sand blaster" cleans the plug hole for good welding, although sand blasting makes such a mess it sucks to use, the copper based weld thru primers weld much better than the zinc based, now Chrysler says to use no weld thru primer at all and I think benz says the same thing. whats the best answer.... a little of all info posted and what ever you can make work, but remember bare metal to bare metal will rust!
there's my 2 cents |
#17
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I use an Inox-Spray (stainless steel spray) from technolit (germany).
Great stuff!!
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Olli |
#18
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great topic, battle with that decision all time, use it ya get crappy welds dont use it you worry about rust, then you take apart a 40 year old car and you see almost shiny metal under laps and joints...makes ya wonder
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Dan Clancy |
#19
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i use wurth weld thru never had any problems mig plug or spot welding i only spray light coat on panels. i think its a must imo
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Carl |
#20
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Weld through primer isn't that great in reality in stopping corrosion, better than nothing though but like the other guys have said a good epoxy is better. I have some steel sheet in my workshop which has weld through primer on one side, it has rust coming through but the other side is worse.
You can also get epoxy paints with high zinc content like Carbozinc 858, it doesn't bond as well as other epoxy paints and you obviously need to paint it directly onto bare metal to benefit from the anti-corrosion properties of the zinc. Carbozinc is ideal for areas like inside sills and then over coated with an epoxy mastic coating. PU adhesive/sealer run along any seams in between coats of epoxy mastic should keep the seams rust free for many a year.
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Mitch |
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