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Thread: Stick Welding
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12th August 2007, 01:41 AM #46GOLD MEMBER
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The biggest problem home welders have is they are 240 volt machines. The professionals use a 415 volt machine and they are far easier to use in every respect. What happens with a 240V machine is the arc actually has a null period where it turns off, now this is very short and not noticeable but it makes intially striking the arc and keeping it going harder than for a 415V machine where the arc is continuous due to it being 3 phase. If you want a welder and have 3 phase look for a 2nd hand one, you will never regret how much easier it makes welding.
CHRIS
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12th August 2007 01:41 AM # ADSGoogle Adsense Advertisement
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15th September 2007, 12:29 PM #47Member
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G'day Grahame, i was wanting to weld up some 20x20x1.6mm RHS using fillet welds. Can this be possible with a arc welder?
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15th September 2007, 02:15 PM #48
Fillets on 1.6 rhs
The short answer is yes.
Variables are:
- your experience
- matching the suitable electrode type and electrode diameter to the job.
- the quality of the machine you choose to weld with
- the amount of practice performed before the job proper
My recommendation is, don't get suckered in to the blue fluxed satincrafttype as they are not suitable and expensive to boot. They don't weld over their own slag sucessfully and are very prone to slag holes if amps are not set high enough/ or if arc length is too long.
I would recommend some cheap chinese 2mm electrodes from one of the hardware guys on ebay.2 kgs of them loose for about $14 plus postage was good value and will do 95 percent of home stick jobs
Grahame
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15th September 2007, 03:19 PM #49
Rhs Welding Technique
The fillet weld in itself is a straight forward weld.
What often causes a problem is the fill in the hollow created btween the radiused edge and the cut edge.
While it is not a fillet weld, a technique for filling it is handy.
If approached with the electrode positioned in the semi vertical, the will surely burn away the thin 1.6mm cut edge.
cheers
Grahame
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16th September 2007, 02:21 PM #50Member
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Thanks for the reply mate. I am wanting to purchase the GMC branded arc welder which is sold at bunnings for 100 $. So i should get some 2.0mm rods and will this machine do for this project? and what settings should i have it on like the amps/voltage.
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16th September 2007, 03:07 PM #51
Amps for 2.00mm electrodes
Unit,
For the GMC machine.If its the one that you can vary the amps say 85 amps. This is a nominal figure, not set in concrete.
It could vary, dependent on your relationship to where your power supply is.
If you live right at the end of the the feeder,you get last chop at the power and might not be drawing 240 volts at the GPO.
Therefore less power in means less out. It changes throughout the day according to load on the grid..
Get more 20 x 20 x 1.6 box material than you need and have a good practice.
When I get my upload problem sorted, I will post some diagrams on electrode positioning relative to welding thin box section (RHS).
PS megacheap hardware was the mob on ebay that i bought the rods from.
Grahame
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17th September 2007, 11:10 AM #52Member
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ok sweet deal. ill get me hands on some more 20x20x1.6 RHS and practice on it wit the amps on 85 and see how she handles it. Cheers for postin the electrode positining stuff, thatll be great once ur uploadin prob is fixed. Yeah ill have a look at the megacheap mob and see what rods they got.
PS. this is the machine i am wanting to get:
http://www.gmcompany.com.au/index.cf...oducts&pid=211
cheers
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