Welder

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cryoscum
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Welder

Postby cryoscum » Wed Mar 13, 2013 8:49 am

Gents

I'm looking for a semi-decent combination MIG/TIG/Stick welder to be used for mild/stainless steel and eventually aluminium (yeah, I know, it's hard, but can be done). I have a 140A stick/TIG welder, but its a scratch start type and I need one with the button arc start and thumb amp control. May as well add MIG to the list then... I won't be welding things more than, I guess, 10mm in thickness so a generator welder capable of 600A is not required :)
Are there any suggestions, or more to the point, specific things or brands I MUST steer clear of? I buy from Hare & Forbes quite often and may do so again if they have what I'm looking for.

Thanks
Nic
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Re: Welder

Postby Stewart » Wed Mar 13, 2013 10:38 am

Why do you need a thumb amp control??
You'll need a 200-250 amp capable welder for 10mm thick steel
mig-tig combinations are fairly rare and useually about the same price as buying the 2 separately.
your current stick/tig welder can have a high voltage unit added to give touch free starts.
Nick ,
What is your invisioned use for the welder ? what type of projects?
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Re: Welder

Postby cryoscum » Wed Mar 13, 2013 11:19 am

Hi Stewart

The thumb control seems to be what is most often used when TIG welding plate or thinner materials. Without it you're welding with whatever you guessed you would need and, combined with scratch start units, this is a real pain.
Combination TIG/MIG/MMA welders seem to be quite common, even Bunnings sell them, but are not cheap and it looks like they are generally scratch start only and DC TIG only.
https://www.machineryhouse.com.au/MIG-TIG-MMA-Multi-Function-Welders

I understand that it may be better to get a dedicated TIG welder that has high frequency start and both AC and DC capabilites. If the unit is above 200A it sounds like it would be good for general TIG use, but also for aluminium later on. They tend to cost about the same as a combination machine though...

To answer your question: Stainless steel and aluminium is what I want to weld. A dedicated TIG welder apparently makes for a good MMA welder anyway. The MIG functionality would have been nice, but I don't do that much mild steel work and for that I have MMA capability already.
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Total impulse for 2016: 32,458 Ns (thus far)
Total impulse for 2015: 84,231 Ns
Total impulse for 2014: 40,757 Ns
Total impulse for 2013: 62,927 Ns

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Re: Welder

Postby Sumo310 » Wed Mar 13, 2013 12:35 pm

You know you're advancing in rocketry when you're need 10mm steel for your build material :shock:
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Re: Welder

Postby rocket_troy » Wed Mar 13, 2013 2:37 pm

Sumo310 wrote:You know you're advancing in rocketry when you're need 10mm steel for your build material :shock:


Yeah… it’s just a bit beyond gazing at used up toilet rolls with curious intentions.

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Re: Welder

Postby Stewart » Wed Mar 13, 2013 3:46 pm

Nic,
I must admit ive been out of the game a few years so am not up on the new inverter type welder combinations. that said tig welding generally requires lower currents than mig or MMA (stick) welding of the same metal ( about 75%), so a dedicated mig welder can be of a lower power output say 170A as against 250A for mig/stick on 10mm ( stick requires less than mig too)
If your going to be welding aluminium than AC/DC with high voltage is really a must have for high strength welds.
Thumb control ? well tig current can be controlled by simply changeing the arc length , longer arc gives reduced current etc, so as long as your in the ballpark with the current setting , its simple manipulation of the arc.
AC/DC +- is a must have if welding complicated shapes, as sometimes changeing the polarity will stop arc drift ( the metal pulling the arc off to one side)
If your tig welding large jobs , the handpiece is going to get HOT! so water cooling is the only option - I doubt you'll need it.
Also if useing AC/DC tig you'll need a selection of different types of tungsten electrodes, some are pure , some thoriated tungsten for AC .
Wished we'ed talked about this last sunday.
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Re: Welder

Postby OverTheTop » Wed Mar 13, 2013 4:08 pm

Someone mentioned Hare & Forbes. They currently have a three day sale happening:

CAUTION : This is a 31MB file!
http://images.machineryhouse.com.au/eve ... Lowres.pdf

Not sure about the quality of the welders though. Maybe someone else has an opinion on that.
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Re: Welder

Postby Scoop1261 » Wed Mar 13, 2013 6:49 pm

Check this link out

http://amweld.com.au/
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Re: Welder

Postby ROCKet STAR » Wed Mar 13, 2013 8:08 pm

OverTheTop wrote:Someone mentioned Hare & Forbes. They currently have a three day sale happening


I discovered this myself earlier today... and impulse bought a milling machine! :D
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Re: Welder

Postby CATO » Wed Mar 13, 2013 8:48 pm

ROCKet STAR wrote:I discovered this myself earlier today... and impulse bought a milling machine! :D


First bit of kit for the new workshop Chris... :D
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Re: Welder

Postby strud » Wed Mar 13, 2013 9:18 pm

Awesome Chris, which one ?


Nick I bought a combination TIG/Stick welder in the last year, I think rated at 180A and it has been awesome.

It is an inverter type unit with thumb button control for current ramping etc and high voltage start.

http://www.machineryhouse.com.au/W163

Have welded all sorts of metal from stainless tube 1.6mm wall to 10mm mild steel.

Unfortunately is a DC inverter unit hence not suitable for Aluminium......

CS

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Re: Welder

Postby Stewart » Wed Mar 13, 2013 9:41 pm

"Unfortunately is a DC inverter unit hence not suitable for Aluminium."
Not entirely true, if the high voltage runs continuously you can use DC on aluminium.
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Re: Welder

Postby OverTheTop » Wed Mar 13, 2013 9:48 pm

OverTheTop wrote:
Someone mentioned Hare & Forbes. They currently have a three day sale happening


I discovered this myself earlier today... and impulse bought a milling machine! :D


I spotted the mills also. I have my eye on a nice one with DROs for about $4k3 inc GST. Unfortunately I spent about $10k on aircon repairs in the past few months so I'll have to wait for the next sale. :(
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Re: Welder

Postby ROCKet STAR » Wed Mar 13, 2013 10:42 pm

strud wrote:Awesome Chris, which one ?


Nothing fancy, just a little Sieg x2. I need a small mill anyway, but I have been planning on building a CNC router, and thought that converting this to CNC would make for a good learning project before I do. Also, a small CNC mill would probably be a handy thing to have when building a CNC router. I have my eye on their AL50-GA lathe too, so I'll probably buy one of those while the sale is on.
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cryoscum
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Re: Welder

Postby cryoscum » Thu Mar 14, 2013 1:54 am

I also have the x2 and it's surprisingly solidand because it is small not too prone to vibration...
AMRS L3 | NAR L3 | QRS 089 | MDRA 224
AMRS Technical Advisory Group

Total impulse for 2016: 32,458 Ns (thus far)
Total impulse for 2015: 84,231 Ns
Total impulse for 2014: 40,757 Ns
Total impulse for 2013: 62,927 Ns


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