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| datsun280zman... |
 Posted: Mon Oct 26, 2009 2:33 pm |
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Guest
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-------------------------------------
I`ve got a spot welder I`m trying to use for thin stainless sheet. (.020")
Problem
is, it`s way too powerful and there`s no adjustment. I`ve been looking at
some way
of toning down the power and was wondering if I can use a variable speed
control
device for controlling the input voltage. The welder is a 110v AC. Would
this
work?
The owners manual that came with it stated that for that gauge of steel
the switch
should have to be depressed for 2-4 seconds. I can`t hold the switch for
more than
1/4 sec without blowing holes through both pieces!
Any help appreciated.
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| dcaster at (no spam) krl.org... |
| Posted: Mon Oct 26, 2009 2:33 pm |
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Guest
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On Oct 26, 8:33 pm, datsun280zman_at_yahoo_dot_... at (no spam) foo.com
(datsun280zman) wrote:
[quote]-------------------------------------
I`ve got a spot welder I`m trying to use for thin stainless sheet. (.020")
Problem
is, it`s way too powerful and there`s no adjustment. I`ve been looking at
some way
of toning down the power and was wondering if I can use a variable speed
control
device for controlling the input voltage.
[/quote]
Stainless has higher electrical resistance and lower heat
conductivity, so it will take less power to spot weld it.
Several things will work. I think a variable speed control will work,
but you need to see what the current draw of the spot welder is and
how much current your variable speed control will supply without
burning up.
You can use a buck transformer to reduce the voltage to the spot
welder. Or a variac.
Depending on the current the spot welder draws, you might be able to
put a 12 volt headlamp in series with the input.
The cheapest solution would be to make a buck transformer using a
Microwave Oven Transformer from a scrapped microwave. Can give you
more info on doing this if that is something you want to try.
Dan |
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| RoyJ... |
| Posted: Mon Oct 26, 2009 6:20 pm |
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We use a suitably rated variac for such things. The variac does not need
to be rated for the full rated amperage of the spot welder as long as
you don't turn the voltage up to near 120 volts. Ie, you can run a 15
amp spot welder on a 5 amp variac but you must limit the voltage to
about 60 volts. Exact max is dependent on the resistance of the tongs,
it can vary.
datsun280zman wrote:
[quote]
-------------------------------------
I`ve got a spot welder I`m trying to use for thin stainless sheet. (.020")
Problem
is, it`s way too powerful and there`s no adjustment. I`ve been looking at
some way
of toning down the power and was wondering if I can use a variable speed
control
device for controlling the input voltage. The welder is a 110v AC. Would
this
work?
The owners manual that came with it stated that for that gauge of steel
the switch
should have to be depressed for 2-4 seconds. I can`t hold the switch for
more than
1/4 sec without blowing holes through both pieces!
Any help appreciated.
##-----------------------------------------------##
Delivered via http://www.rittercnc.com/
Metalworking Forums
Web and RSS access to your favorite newsgroup -
sci.engr.joining.welding - 11648 messages and counting!
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| dan... |
| Posted: Mon Oct 26, 2009 6:38 pm |
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What's that Lassie? You say that datsun280zman fell down the old
sci.engr.joining.welding mine and will die if we don't mount a rescue
by Mon, 26 Oct 2009 20:33:36 +0000:
[quote]I`ve got a spot welder I`m trying to use for thin stainless sheet. (.020")
Problem
is, it`s way too powerful and there`s no adjustment. I`ve been looking at
some way
of toning down the power and was wondering if I can use a variable speed
control
device for controlling the input voltage. The welder is a 110v AC. Would
this
work?
The owners manual that came with it stated that for that gauge of steel
the switch
should have to be depressed for 2-4 seconds. I can`t hold the switch for
more than
1/4 sec without blowing holes through both pieces!
Any help appreciated.
[/quote]
Could you change tips to something wider, to spread the power over a
larger area?
--
Dan H.
northshore MA. |
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