ernie always says the thermal arc 185 is the best value. i wish i bought it
instead of the lincoln i got (squarewave tig 175), though, i'm satisfied
with the lincoln but it weighs over 200 pounds, would be nice to have the
capability to EASILY transport it. i'm not an expert here, just putting in
my $.02. from what i gather you can make serviceable welds w/o the pulse
feature (and save yourself some money not buying the pulser) but i think the
pulser allows you to more easily make prettier welds (stack of dimes bead).
oh, was going to ask if you are subscribe to sci.engr.joining.welding but i
see you are. ernie is generally regarded as the resident uber-guru, if you
ever expect to get any welding advice on these lists in the future (which
you inevitably will). :-) you'd better beg forgiveness, he's a font of
invaluable free information and advice, (and is well regarded amongst the
other denizens on these lists)
I have the Squarewave Tig 175 also. Snagged the Lincoln 175 Pulser on
Ebay a while back. Vastly expanded the quality and range of the welds.
You can literally weld pop cans with it. Best upgrade I ever got.
Dweller in te cellar
William Wixon wrote:
Home Page: http://www.seanet.com/~jasonrnorth
Some people take to the pulser like a fish to water, others find it
frustrating and hard to adjust. I would try it first before
I don't see much use for it in your stated application. The pulser is
used to control heat input on thin sections or in high amperage
applications. Neither which applies to tubular frame construction.
If given the choice I would spend the money on a water cooler. Not a
necessity but much more useful.
TIG isn't necessary (or it could be argued, appropriate) for what you
want to do.
Nice welds, if you have the skill, but overkill for doing a nice job
on fairly heavy tubing.
MIG for speed. Stick for cheap. TIG for neither of those. :-)
If you don't know whether the pulse is a requirement, you probably
don't need or want it.
Now, if you wanted to get into welding your own aluminum tube frame
bicycles together, pulse would be quite a handy thing to have, I think.
(Who also want a TIG machine in his shop!)
the TIG welding machine I'm planning to buy can be switched between AC
and DC, which gives it more flexibility in the metals it can weld.
Some welders told me that many people have problems with achieving
sufficient weld penetration with a MIG.
Most expert recommend TIG so I'm just following their advice.
On Wed, 01 Aug 2007 19:31:21 -0700, firstname.lastname@example.org wrote:
Application is a tube chassis vehicle:
No specification given for the tubing. Is this round tubing or square
stock? What diameter or dimesions is the tubing? What is the wall
thickness? A little more information could help clarify what weld
process would be best.
Some have suggested MIG, but MIG runs very quickly and can be
difficult to make good welds with on round tubing. Particularly if you
have little experience welding pipe. You may find that consistant weld
penetration is difficult to achieve as you constantly have to modify
the gun angle when you work your way around the tubing. Or, you may
over penetrate from not being able to adjust quickly enough and blow
holes. Further, you will probably need to stop the weld at least once,
rearrange your position, and restart the weld on the other unwelded
half of the joint. Without properly grinding the preexisting weld
ends, you may have a serious weak spot in the weld where it laps the
preexisting welded area.
If you do decide to use a MIG welder, I would suggest using flux cored
wire. The stuff runs very smoothly in all positions, has good
penetration, and even if you have little experience with pipe/tube
welding, a little practice should have you making acceptable welds.
Since it sounds like you need high quality welds with a lesser chance
of cracking or breaking due to vibration in the finished vehicle, I
would go with TIG. Try to find weld inserts suiable to your base metal
if you use TIG. This makes for a great method to produce a high
quality root pass. TIG welds will, however, take a much longer time to
Joint preparation is KEY in this type of welding. Read up about how to
do it for the stock you are using and the process you are using.
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