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Posted by Charles Ping on July 28, 2008, 7:13 am
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> Do you have to weld this? Brazing may be a better alternative as it
> doesn't melt the parent metal.
> Have you considered gas welding?
> When I needed to weld some thin steel, I found a gas set beat a MIG
> welder. My technique was to use a thick filler rod as a thermal mass
> to avoid making holes in the steel. Preheating the end of the rod to
> almost meting point before applying it to the weld area helped as
> well.
>
> John
Thin steel with compound curves - and there's a lot of it to patch up
so silver soldering or brazing would be very expensive (even if I
could keep the heat distortion at bay).
Gas in my book has two big problems. The distortion is one and the
cost of the bottles is another. If I tot up what I've paid BOC in
rental over the past decade for just one argon bottle it'll be a lot
more than the cost of a TIG welder. The fact that I have MIG already
does mean that MIG and TIG can share gas and it becomes a sensible
option.
Charles
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Posted by Tim Leech on July 28, 2008, 7:51 am
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On Mon, 28 Jul 2008 04:13:27 -0700 (PDT), Charles Ping
>
>
>Thin steel with compound curves - and there's a lot of it to patch up
>so silver soldering or brazing would be very expensive (even if I
>could keep the heat distortion at bay).
>Gas in my book has two big problems. The distortion is one and the
>cost of the bottles is another. If I tot up what I've paid BOC in
>rental over the past decade for just one argon bottle it'll be a lot
>more than the cost of a TIG welder. The fact that I have MIG already
>does mean that MIG and TIG can share gas and it becomes a sensible
>option.
>
>Charles
Charles
Do you use straight Argon on your MIG?
I suppose it would be OK on thin material, I tried it on 4mm plate a
few years ago when I ran out of mixed gas, panic job on a Sunday, I
did struggle do get a decent result.
Tim
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Posted by Mark Rand on July 28, 2008, 5:23 pm
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>On Mon, 28 Jul 2008 04:13:27 -0700 (PDT), Charles Ping
>
>
>>
>>
>>Thin steel with compound curves - and there's a lot of it to patch up
>>so silver soldering or brazing would be very expensive (even if I
>>could keep the heat distortion at bay).
>>Gas in my book has two big problems. The distortion is one and the
>>cost of the bottles is another. If I tot up what I've paid BOC in
>>rental over the past decade for just one argon bottle it'll be a lot
>>more than the cost of a TIG welder. The fact that I have MIG already
>>does mean that MIG and TIG can share gas and it becomes a sensible
>>option.
>>
>>Charles
>
>Charles
>
>Do you use straight Argon on your MIG?
>I suppose it would be OK on thin material, I tried it on 4mm plate a
>few years ago when I ran out of mixed gas, panic job on a Sunday, I
>did struggle do get a decent result.
>
>Tim
I would have thought 4mm was a bit much even for mixed gas. pure argon would
probably be dire at that thickness.
Pub gas in bought bottles is far more economic than BOC's extortion for MIG
:-|
Mark Rand
RTFM
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Posted by Tim Leech on July 28, 2008, 5:45 pm
Please log in for more thread options On Mon, 28 Jul 2008 22:23:58 +0100, Mark Rand
>>Charles
>>
>>Do you use straight Argon on your MIG?
>>I suppose it would be OK on thin material, I tried it on 4mm plate a
>>few years ago when I ran out of mixed gas, panic job on a Sunday, I
>>did struggle do get a decent result.
>>
>>Tim
>
>
>I would have thought 4mm was a bit much even for mixed gas. pure argon would
>probably be dire at that thickness.
>
>
There are different mixtures for different thicknesses, BOC offer
Argon with 5% CO2 for thin stuff up to 4mm, 12% for 4 to 10mm & 20%
for 10mm & upwards, with a sniff of O2 for good measure.
Tim
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Posted by moray on July 29, 2008, 10:11 am
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> On Mon, 28 Jul 2008 22:23:58 +0100, Mark Rand
>
>
>>>Charles
>>>
>>>Do you use straight Argon on your MIG?
>>>I suppose it would be OK on thin material, I tried it on 4mm plate a
>>>few years ago when I ran out of mixed gas, panic job on a Sunday, I
>>>did struggle do get a decent result.
>>>
>>>Tim
>>
>>
>>I would have thought 4mm was a bit much even for mixed gas. pure argon
>>would
>>probably be dire at that thickness.
>>
>>
>
> There are different mixtures for different thicknesses, BOC offer
> Argon with 5% CO2 for thin stuff up to 4mm, 12% for 4 to 10mm & 20%
> for 10mm & upwards, with a sniff of O2 for good measure.
>
> Tim
>
Conviently sold as Argoshield Light, Universal, and Heavy.
The O2 trace helps burn impurities out of MIG welds, but it means it's
useless for TIG welding, so you have to pay about twice as much for an
equivalent sized bottle of pure argon.
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> doesn't melt the parent metal.
> Have you considered gas welding?
> When I needed to weld some thin steel, I found a gas set beat a MIG
> welder. My technique was to use a thick filler rod as a thermal mass
> to avoid making holes in the steel. Preheating the end of the rod to
> almost meting point before applying it to the weld area helped as
> well.
>
> John