20 Most Recent Thermal Dynamics CUTMASTER 81 Air Plasma Cutting System 460 Volt, 40181 Phase With SL60 75 Hand Torch With 20 Leads Questions & Answers

Check antifreeze and level of your rad,and your thermostat it might be opening to soon.

Thermal Dynamics... | Answered on Dec 18, 2014

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...

Welding Tools | Answered on Dec 26, 2020

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.

Welding Tools | Answered on Dec 22, 2020

If you need plasma cutters visit this site

Welding Tools | Answered on Dec 02, 2020

This is one is a common issue you have to read the tig welder guide and I am sure you will find something. https://myweldingyard.com/best-tig-welder

Welding Tools | Answered on Nov 11, 2020

Contact Mastercraft directly to inquire.

Welding Tools | Answered on Nov 04, 2020

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.

Welding Tools | Answered on Nov 02, 2020

wires in lead to the handle may be broken

Welding Tools | Answered on Jul 11, 2020

the 8 setting nob is for what?

Welding Tools | Answered on May 31, 2020

It is possible to contact a vendor online:


Welding Tools | Answered on May 28, 2020

The correct current, or amperage, setting primarily depends on the diameter and type of electrode selected. For example, a 1/8-inch 6010 rod runs well from 75 to 125 amps, while a 5/32-inch 7018 rod welds at currents up to 220 amps. The side of the electrode box usually indicates operating ranges. Select an amperage based on the material thickness, welding position (about 15 percent less heat for overhead work compared to a flat weld) and observation of the finished weld. Most new welding machines have a permanent label that recommends amperage settings for a variety of electrodes and material thicknesses.

Welding Tools | Answered on Apr 02, 2020


Welding Tools | Answered on Mar 30, 2020


So, for gasless MIG welding polarity (when using flux core wire), your MIG welding polarity settings should be set to direct current electrode negative (or DCEN). With DCEN, the negative terminal inside your machine is hooked up to your electrode (your MIG gun) while the positive terminal is hooked up to your ground.


Welding Tools | Answered on Mar 22, 2020

Not finding what you are looking for?
Thermal Dynamics CUTMASTER 81 Air Plasma Cutting System 460 Volt, 40181 Phase With SL60 75 Hand Torch With 20 Leads Logo

1 questions posted

Ask a Question

Usually answered in minutes!

Top Thermal Dynamics Welding Tools Experts

Bill Boyd

Level 3 Expert

53816 Answers

Brad Brown

Level 3 Expert

18563 Answers

ray gallant

Level 3 Expert

71004 Answers

Are you a Thermal Dynamics Welding Tool Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Thermal Dynamics Welding Tools

  • Thermal Dynamics Welding Tools

Most Popular Question

when start cutting sheet torch flame

  • Welding Tools