TIG Foot Pedal Control: The Complete Guide

How to use your foot pedal for precise heat control in TIG welding

Introduction

The foot pedal is what makes TIG special. Unlike MIG where you set your amperage and forget it, TIG lets you adjust heat in real time as you weld.

How the Pedal Works

The pedal controls amperage:

• Neutral position = Minimum amperage (usually 5-10 amps)
• Fully pressed = Maximum amperage (your machine setting)
• Partial press = Somewhere in between

Think of it like a gas pedal in a car. You press to go faster (more heat), lift to slow down (less heat).

Setting Up

Maximum Amperage

Before you start, set your machine's maximum amperage:

• Thin material (18 gauge or thinner): 50-100 amps
• Medium material (1/8 to 1/4 inch): 100-200 amps
• Thick material (1/4 inch and up): 200+ amps

Minimum Amperage

Set your minimum (pedal in neutral): 5-10 amps is typical, enough to maintain the arc.

Technique

Starting the Weld

1. Place foot on pedal
2. Establish arc at minimum amperage
3. Wait for puddle to form
4. Begin moving torch
5. Gradually press pedal to increase heat as needed

During the Weld

• On thin sections: Stay near minimum amperage, use fast travel
• On thick sections: Press harder, go slower
• When adding filler: Slightly increase heat to melt rod

Ending the Weld

1. Gradually release pedal to reduce amperage
2. Crater fills as you reduce heat
3. Lift torch to break arc

Common Mistakes

Fix: Start at minimum, build heat gradually.

Fix: Adjust throughout the weld based on material thickness.

Fix: Smooth, gradual movements.

Practical Applications

The Feel

Good TIG welding is about feel. The pedal should feel like an extension of your body. Practice until you do not think about it.

Sources

• Lincoln Electric, TIG Welding Fundamentals
• Miller, Understanding TIG Pedal Control
• TIG Welding Handbook, Weldcote