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Weller Portasol Pro Cordless Butane Soldering Iron Kit - Page 8 Questions & Answers
Where does the gas line connect on a micro torch?
A micro welding torch should be a smaller version of a full size welding torch - identical apart from size. It is most important a user thoroughly familiarises himself or herself with the correct usage and safety precautions because failure to observe the correct procedure can result in extreme danger. A flashback can have potentially serious consequences...
A person who is thoroughly conversant with the procedure and safety will know how to connect the hoses to the welding torch and to the cylinders - if it is a quality unit, it is an intuitive process due to the fuel gas fittings being left hand thread and the oxygen normal or right hand thread and the hoses are or should be different colours with blue being the norm for oxygen and red or orange for the fuel gas.
One final word - never, ever, under any circumstances use a lubricant on the threads of the oxygen bottle or associated fittings...
Rossi 220BZ welder. Why am I getting wire glow with trigger NOT pulled?
A great many older home mig welders were produced with a live torch, ie. the manufacturer had saved the cost of the contactor, the high current electromechanical relay that switches the welding current on or off in response to the torch trigger...
It was inevitable some manufacturers would replace the rectifiers and contactor with thyristors (SCRs) and obtain both functions from a single modification.
The trigger switch controls the wire motor and the contactor so if the wire motor is working ok it is unlikely the fault is there and if your welder has a contactor it could be stuck or a wiring fault has caused the coil to be permanently energised or if your welder uses the solid state version, either one or more of the thyristors have failed or a circuit fault has caused the supply to the gate to be permanent causing them to be permanently switched on.
Hi, my dad has an Eland 175 welder. It was working perfectly but he then tried running it on a generator. The welder kind of worked but the stopped welding.
Wire, gas, solenoid, fan, big relay all work fine. I removed and metered the diodes and they are fine. 2 fuses are fine. 6 large capacitors seem ok and no apparent burns or blowouts on the circuit board. Checked the earth cable and that appears to be fine as well.
No apparent amps going doing the wire although I'm not 100% sure how to check that.
Any ideas?
Thank you
It would seem the low current control side of the welder is working ok - you squeeze the trigger of the torch and the wire comes out and the gas flows and the the main contactor clunks?
I doubt running on a generator has anything to do with the problem and it was coincidence - if the generator voltage surge or spike was going to cause a problem it would be the control side, the sensitive electronics. The high current side is much more robust.
Welding current is supplied to the torch through a cable and is connected to the wire by the copper tip the welding wire is pushed through.
Don't worry about measuring the amps - measure the voltage through the circuit from mains voltage going into the big transformer, probably 20 - 40 volts AC from the transformer, being changed to DC and reaching the contactor and then leaving the contactor and being delivered to the torch when the trigger is operated.
If the big transformer is ok, the most common problem is with the torch assembly where the constant flexing in use often damages the pipe, wiring, main cable and welding wire liner - a lot is forced into that thick tube supplying the torch which is why professional welding machines tend to use the Eurotorch so a spare torch assembly can simply be plugged into the machine and the welding job completed.
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