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Forney EASY WELD 100 ST - User Manual

Forney EASY WELD 100 ST
20 pages
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WWW.FORNEYIND.COM
100 ST STICK/TIG
ARC WELDER
OPERATING MANUAL
FEATURES:
90A Output
120V Input
Easy to use
Portable
Lift arc TIG capable
SPECIFICATIONS:
Recommended Electrode Diameter: Up to 1/8”
Plate thickness range: 16 ga - 5/16” (7.94mm)
Weight: 8.38 Lbs. (3.8 Kg)
Dimensions: 16.1” (410mm) X 4.8”
(122mm) X 10.8” (274mm)
6 month warranty
IDEAL FOR:
Do-It-Yourself, Maintenance & Repair, Hobbyist
ENGLISH
REV 05.23.16

Questions and Answers

  • B
    barrynobleJul 27, 2025
    Why is the yellow indicator light on my Forney Welding System?
    • R
      rebeccalewisJul 27, 2025
      The yellow indicator light may turn on due to poor ventilation leading to overheating, a high ambient temperature, or exceeding the rated duty cycle. To resolve this, improve the ventilation around your welding system. If overheating is the cause, the system should automatically recover once the temperature decreases.
  • K
    Kelly HartAug 2, 2025
    Why is my Forney Welding System power source tripping?
    • R
      rhonda45Aug 2, 2025
      Your Forney Welding System's power source might be tripping due to a few reasons. If power has been off for an extended period (more than two days), the tripping may be caused by the main power filter's capacity charging. If it trips during welding, try switching on the main power source.
  • L
    lstoneAug 8, 2025
    Why are the electrode holder and cable getting hot on my Forney Welding System?
    • T
      Tracy BerryAug 8, 2025
      If the electrode holder and cable are getting hot, and the polarity sockets are also heating up, it could be due to several reasons. The electrode holder's capacity might be too small, in which case you should replace it with a bigger one. Alternatively, the cable might be too small; replace it with one that meets the requirements. Also, check for looseness in the socket; remove any oxide skin and tighten it. Increased resistance between the electrode holder and the cable can also cause overheating.
  • M
    Matthew McintoshAug 14, 2025
    What to do if the cooling fan is not working on my Forney Welding System?
    • H
      Heidi MccarthyAug 14, 2025
      If the cooling fan on your Forney Welding System isn't working or is turning very slowly, it could be due to a few reasons. The switch might be broken, requiring replacement. The fan itself could be broken, in which case you should replace or repair it. Also, check for any broken or loose wires and ensure they are properly connected.
  • J
    jimdrakeAug 20, 2025
    How to fix the adjustment knob if it doesn't work on my Forney Welding System?
    • K
      Keith CochranAug 20, 2025
      If the adjustment knob on the front panel of your Forney Welding System isn't working, it's likely that the potentiometer (current regulation) is broken. You will need to replace the potentiometer.

Summary

Safety Information

Personal Protection Guidelines

Eye, Skin, and Respiratory Safety

Essential advice on protecting eyes, skin, and respiratory system from arc rays, fumes, and vapors.

Hazardous Fumes and Vapors

Details risks associated with welding fumes and vapors, and necessary ventilation precautions.

Fire Prevention Measures

Combustible Material Management

Guidelines for identifying and mitigating fire hazards from combustible materials in the work area.

Electric Shock Safety

Critical Shock Prevention

Vital warnings and instructions to prevent dangerous electric shock when operating the welder.

Welding Current Circuit Awareness

Identifies components of the electrical circuit to avoid contact with during welding.

Installation Procedures

Power Source and Extension Cord Guidelines

Instructions for connecting to the power source and selecting appropriate extension cords.

Welding Preparation Steps

Connecting Welding Leads and Electrode

Instructions for correctly attaching welding leads and securing the electrode to the holder.

Typical Welding Setup Configurations

Welder Operation Guide

Controls and Amperage Settings

Identification and explanation of the welder's front panel controls and recommended amperage settings.

Welding Techniques and Safety

Welding Pitfalls and Maintenance

Troubleshooting Common Issues

Problem Resolution Chart

A diagnostic chart providing possible causes and solutions for common welder problems.

Forney EASY WELD 100 ST Specifications

General IconGeneral
TypeMIG Welder
Input Voltage120V
Input Current20A
Gasless OperationYes
Duty Cycle20% at 90A
Electrode Size0.030-0.035 inch
Welding Thickness1/4 in.
Electrode Size Range0.030 to 0.035 inch
Output Amperage100A

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