Does anyone out there have any expieriance welding (resistance welding?)
nuts on to .083 sheet metal. Need to attatch 3600 5/16 nuts to some .083
mild steel Stampings. Once had heard about something called projection
welding where special nuts were manufactured with protrusions to assist spot
welding of them . Trying to find some info or at least a dirrection to go
Thanks in advance
John Kish
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Very common method. decent data sheets here:
http://www.on-b.com/weld/wldguide.htm
You can get them in all sorts of configurations. The ones I've seen used
most are square like an old fashioned stove bolt nut, have 4 projections
that make the high resistance contact with the base metal, and have a
protruding ring that centers the nut in the proper spot. See P/N WP2701
at Ohio Nut. For your 5/16" nuts the pilot hole would be 3/8". If the
base metal is already drilled, you can use the no shoulder version but
you need some sort of fixture to align the nut with the hole.
It does take a fairly decent sized spot welder. It's been a while so I'm
not sure on the minimum for your application. The spot welder setting is
quite critical to get a consistent weld. Too little heat and pressure
and the nuts break right off. Too much and the threads get crushed
and/or melted.
John Kish wrote:
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