Forney 420 Quick Start Manual

ITEM# 420

TIG QUICK START GUIDE

220 AC/DC WELDER
1.
Read user manual
2.
Select
3.
Connect TIG torch and
ground clamp
7.
Choose between High Frequency (HF) start
or Lift start.
ELECTRODE IS ALWAYS ELECTRICALLY
HOT WHILE IN TIG MODE

Workpiece grounding

Connect ground clamp to clean, bare metal. No rust,
paint or other coatings. Attach the ground clamp
directly to the workpiece if you are experiencing issues.
Frequently tripping circuit breaker or exceeding
duty cycle
Welder should be the only thing plugged into the circuit.
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FORNEYIND.COM
QUESTIONS OR TROUBLE? Contact Forney Industries at 1-800-521-6038 customerservice@forneyind.com
process
* TIG Torch sold separately
4.
Connect TIG torch lead
to gas (100% Argon)

TIG TROUBLESHOOTING TIPS

TIG Torch
5.
Adjust amperage per
material thickness

Workpiece Preperation

Low weld output or poor fusion

110-120V
• Usually due to low input power.
• Welder should be only thing plugged into circuit.
• Avoid using extension cords. If one must be used, it must be 3 conductor #12 AWG
or larger up to 25 feet
• Generators must be a minimum 5,000W continuous output with no low-idle function
(or low-idle off), 5% THD Max.
Low weld output or poor fusion
208-240V
• Usually due to low input power.
• Welder should be only thing plugged into circuit.
• Avoid using extension cords. If one must be used, it must be 3 conductor #8 AWG.
• Generators must be a minimum 10,000W continuous output with no low-idle
function (or low-idle off), 5% THD Max.
forneyind.com
6.
Connect to input power
• Generator OK with continuous output >
5,000 W (120V) or 10,000 W (230V)
• Extension cord: #12 AWG (120V) or #8
AWG (230V) or larger. 25' (8m) or shorter
extension cords recommended
To ensure maximum quality, always clean
and prepare welding surfaces.
Ground
Clamp
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