Thermal Arc LM-200 ARCMASTER

Questions and Answers

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Mr. James WoodsAug 5, 2025
What to do if my Thermal Arc Welding System has inconsistent wire feed?
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  Richard AdamsAug 5, 2025
  Inconsistent wire feed can be caused by several factors. The wire spool brake may be too tight, causing the feed roller to slip, or too loose, leading to wire tangling. Make sure you are using the correct 'U' groove drive feed roller matched to the aluminium wire size you are welding. Misalignment of inlet/outlet guides can cause the wire to rub, reducing feedability. A liner blocked with wire debris, possibly from using an incorrect feed roller groove shape or size, can also be the cause. Finally, an incorrect or worn contact tip can lead to arcing inside the tip and wire jamming.
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gkellyAug 10, 2025
Why does my Thermal Arc LM-200 ARCMASTER arc not have a crisp sound?
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  Deborah HarmonAug 11, 2025
  If your arc doesn't have a crisp sound, it might be because the MIG torch is connected to the wrong voltage polarity on the front panel. Connect the MIG torch to the positive (+) welding terminal when using solid wires and gas shielded flux cored wires.
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Linda KellerAug 15, 2025
Why does the gas flow won't shut off in my Thermal Arc Welding System?
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  Isaac JonesAug 15, 2025
  If the gas flow won't shut off, it could be due to several reasons. If the weld mode (STD, SLOPE, REPEAT, or SPOT) was changed before the POST-FLOW gas time had finished, strike an arc to complete the weld cycle. Also, check if the POST-FLOW control is set to 60 seconds and reduce the POST-FLOW time if needed. If those don't help, you might need to have an Accredited Thermal Arc Service Agent replace or repair faulty or jammed gas valve.
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mossdavidAug 20, 2025
What to do if my Thermal Arc LM-200 ARCMASTER Welding System produces a cold weld puddle?
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  Thomas StewartAug 20, 2025
  A cold weld puddle may be due to several factors: * Loose welding cable connections: Check all welding cable connections. * Low primary voltage: Contact your supply authority. * Faulty rectifier unit: Have an Accredited Thermal Arc Service Agent test and replace the faulty component.
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Amy Harding DVMAug 25, 2025
What happens if there is poor work lead contact to work piece in Thermal Arc LM-200 ARCMASTER?
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  Natalie GomezAug 26, 2025
  If the work lead has poor electrical contact with the workpiece, the connection point will heat up, which results in a reduction of power at the arc.
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Jennifer CarterOct 30, 2025
How to fix porosity in Thermal Arc LM-200 ARCMASTER?
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  Patricia BurnsOct 31, 2025
  Porosity in your welds can stem from several issues. First, ensure your gas cylinder isn't empty and the flow meter is correctly set to 25 cubic feet per hour. Check for gas leaks from the regulator/cylinder connection to the gas hose at the wire feeder. Also, make sure the internal gas hose in the wire feeder isn't fractured and is properly connected to the MIG torch adapter. Shield the welding area from wind or increase gas flow if you're welding in a windy environment. Clean any contaminants off the plate if you're welding dirty, oily, painted, oxidized, or greasy material. Keep the distance between the MIG torch nozzle and the workpiece to a minimum. Finally, perform regular MIG torch maintenance, ensuring gas holes aren't blocked, gas exits the torch nozzle freely, spatter doesn't bui...

Summary

General Information

Notes, Cautions and Warnings

Important safety notes and warnings for users.

Important Safety Precautions

Key safety guidelines for operating the equipment.

Publications

List of related publications for further reference.

Documents De Reference

References to other relevant documents.

Introduction and Description

Product Overview and Diagrams

Description of the LM-200 and its functional block diagrams.

Installation and Setup

Guidelines for transporting, installing, and locating the unit.

Electrical Input and Specifications

Details on input voltage, power, specifications, and duty cycle.

Operator Controls

Front Panel Controls

Details on physical controls, terminals, and switches on the front panel.

Welding Parameter Settings

How to adjust weld voltage, current, and other parameters.

Remote Control Features

Information on using remote control sockets and switches.

Power Source Features

Unit features like self-diagnosis and save/load functionality.

Sequence of Operation

Welding Process Setup

Steps for setting up STICK, LIFT TIG, and MIG welding processes.

Control Functions

Usage of Contactor, Remote, LED displays, Save/Load, Knob, and Buttons.

Routine Maintenance

Procedures for cleaning and inspection of the unit.

Basic Trouble Shooting

MIG Welding Troubleshooting

Common issues and solutions for MIG welding.

TIG Welding Troubleshooting

Common issues and solutions for TIG welding.

Stick Welding Troubleshooting

Common issues and solutions for Stick welding.

Voltage Reduction Device (VRD)

VRD Specification

Technical specifications for the Voltage Reduction Device.

VRD Maintenance

Maintenance procedures for the VRD.

Switching VRD On;Off

Instructions on how to enable or disable the VRD.

Power Source Error Codes

List and explanation of power source error codes.

Advanced Troubleshooting

System-Level Fault Isolation

Procedures for isolating defective subsystems.

Opening the Enclosure

Step-by-step instructions to open the unit's enclosure.

Error Code Verification and Remedy

Troubleshooting specific error codes and their remedies.

Symbol Legend

Thermal Arc LM-200 ARCMASTER Specifications

General

Input Frequency	50/60 Hz
Output Amperage Range	5 - 200 A
Duty Cycle	60% at 200A
Input Voltage	230V
Input Phase	Single Phase
Rated Output	200 A
Welding Process	SMAW (Stick)