Welder Training MAG or MMA or TIG

Introduction

MIG – This process uses pure “Argon” (Inert Gas) to weld Aluminium and Stainless steels.

MAG – This process uses a mixture of Argon & Co2 (Active Gas) to weld Mild steels

Gas Types – Active gas mixtures are available in the following mixture ratios

• 95% Argon / 5% Co2 – commonly known as “Light” and used for welding light gauge material (up to 4mm)
• 88% Argon / 12% Co2 – commonly known as “Universal” and used for welding medium gauge material (4mm – 12mm)
• 80% Argon / 20% Co2 – commonly known as “Heavy” and used for welding heavy gauge material (12mm and above)

Shielding Gas Flow Rates

The gas flow rate should be around 12-16 litres per min. This should be checked at the end of the gas nozzle using a gas flow meter (“pea shooter”).

Advantages:

· Welding can be performed in all positions

· Higher welding speeds than other processes

· Post weld cleaning is reduced to minimum

· Manipulation skills are easily learnt and mastered by apprentices

· The process is easily adapted to mechanized or robotic applications

Limitations are:

· Equipment is more complex and expensive than that of alternative processes

· Hard to reach locations are less easily welded because of bulky torch and cables

· Wind or air drafts may compromise gas shielding

· High heat may be uncomfortable to welders

· Correct parameter selection learning needs dedicated training

Assembly of MIGS / MAGS equipment

The set up consists of:

· Power source

· Wire feed unit

· External shielding gas supply

· Welding torch (Negative)

· Water cooling unit