GMAW WELDING (MIG)

Metal Insert Gas (Gas Metal Arc Welding)

Lynn Welding provides Nadcap accredited fusion welding services and specializes in GMAW (Gas Metal Arc Welding).

MIG Welding or GMAW (Gas Metal Arc Welding)

The MIG welding process is different than the TIG welding and has different application in material joining.

GMWA main character is feeding the electrode/filler material continuously through the welding gun. In this is case the electrode is melted and deposited into the base material to create the weld joint.

The shielding gas is created from the welding gun as well to help protecting the weld from contamination. GMAW uses inert gas as well by using argon and helium and some would use carbon dioxide as it depends on the type of application and the material you are using. 

The electrode is consumable and mainly comes in spools. According to the American Welding Society, the electrode is identified by letters ER and numbers after that present a unique characteristic. Each character is an identification for the wire, and it is strength.

For example the first two letter ER presents the electrode, the second two numbers present the strength of the filler material in PSI, the forth letter presents wire type (S) which is solid wire for instance, the last number presents the chemical composition.

For example, ER-70S-2 or ER 70S-6 as each number and letter shows a unique identification of the electrode.

A photos GMAW process element.

Metal Insert Gas (Gas Metal Arc Welding)

Source: America Welding Society

There are different types of the metal transfer and they all use different voltages and current to achieve best weld results.

GMAW has four-metal transfer which are globular transfer, pulsed arc, short circuiting, and spray transfer. Each method is used based on the material and application used.

See below different types of metal transfer showing spray, globular and short-circuiting transfer.

GTAW Welding Services

Source: American Welding Society

The wire and the base material have to be clean to produce a quality weld. Any contamination will affect the weld as the GMAW tends to lose more shielding gas than the GTAW.

Lack of penetration is another challenge when using the GMAW process however with an experience welder, correct set up and right method of depositing, penetration can be achieved.

We often consider GMAW as the more heavy-duty process as it is designated for structural welding application.

Our team well qualified and experienced to perform GTAW and GMAW to produce quality, clean and successful weld.

Lynn Welding is qualified to perform GMAW process per AWS D1.1, D1.2 and D1.6.

Hope you enjoyed reading the article and learned a little about each process!

Lynn Welding's GMAW Welding (MIG) Approvals


Raytheon

Raytheon

Lynn Welding is a well known Raytheon Approved Welding company when it comes to welding and machining for the Aerospace, Defense, Nuclear, Industrial, and Medical industries.

Raytheon Approved Fusion Welding


Bell Helicopter

Bell Helicopter

Lynn Welding is Bell Helicopter approved for Resistance Welding and Fusion Welding processes, and preparation of metals.

Bell Helicopter Approved Fusion Welding


General Electric

General Electric

Lynn Welding holds a certification from GE Aviation for Fusion Welding, Brazing, & Resistance Welding.

General Electric Approved Fusion Welding


Collins Aerospace (Hamilton Sunstrand / UTAS)

Collins Aerospace (Hamilton Sunstrand / UTAS)

All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)

Collins Aerospace (Hamilton Sunstrand / UTAS) Approved Fusion Welding


Kaman Aerospace

Kaman Aerospace

Approved by Kaman Aerospace for Fusion Welding, Resistance Stitch Welding, Resistance Seam Welding.

Kaman Aerospace Approved Fusion Welding


Northrop Grumman

Northrop Grumman

Approved by Northrop Grumman for Fusion Welding & Resistance Welding. All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)

Northrop Grumman Approved Fusion Welding


United Launch Alliance

United Launch Alliance

United Launch Alliance welding certifications. All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)

United Launch Alliance Approved Fusion Welding


Sikorsky

Sikorsky

Lynn Welding holds a Sikorski-Approved Welding Certification for Fusion Welding, Brazing & Resistance Welding

Sikorsky Approved Fusion Welding


General Dynamics

General Dynamics

Lynn Welding is approved by General Dynamics for Fusion Welding, Resistance Welding, Spot, Seam and Stitch

General Dynamics Approved Fusion Welding


Hawker Beechcraft

Hawker Beechcraft

We are an approved Hawker Beechcraft welder and fabricator for Fusion Welding and Resistance Welding, Spot and Seam

Hawker Beechcraft Approved Fusion Welding


GMAW Welding (MIG) Blog Articles

Tell Us About
Your GMAW Welding (MIG) Project

QUOTES WITHIN 24 HOURS

75 Rockwell Road
Newington, CT, 06111

Phone: 860.667.4400
Email: sales@lynnwelding.com