Welding Procedures and Techniques
Our engineers specialize in solving welding engineering problems, weld failure analysis, eliminating weld defects, soldering, brazing, expert witness services, and developing welding procedures.  We provide procedure and techniques to solve your arc, MIG, TIG, laser, electron beam, resistance, or plasma welding procedures.  We provide solutions to steel, stainless steel, aluminum, nickel, or titanium welding processes.  
Our Principal Engineer has experience in Aluminum, Steel, Stainless Steel, Nickel alloys, and various types of metals and welding procedures including aircraft, industrial machinery, ships, and under sea pipelines.  We can solve your soldering, brazing, and welding problems.

 

Engineering Consulting
We provide welding engineering solutions to our customers industrial problems.  Common procedures such as flux cored arc welding, TIG, MIG, arc welding are among our specialty. Our goal is to identify problems and specify techniques to enhance customer capabilities.  Examples of AMC's experience includes oil refineries, petrochemical plants, pipelines, aircraft, food industry, medical supplies, ships, and gas turbine engines.

Our experience include a range of welding, soldering and brazing processes using various alloys.  If you do not see information on your specific joining process or alloy system please contact us about your individual consulting needs.

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GTAW Welding, TIG welding

Gas Tungsten Arc Welding (GTAW) is frequently referred to as TIG welding.  TIG welding is a commonly used high quality welding process.  TIG welding has become a popular choice of welding processes when high quality, precision welding is required.

In TIG welding an arc is formed between a nonconsumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool.  If filler wire is used, it is added to the weld pool separately.

 

TIG Welding Benefits

• Superior quality welds
• Welds can be made with or without filler metal
• Precise control of welding variables (heat)
• Free of spatter
• Low distortion

Shielding Gases

• Argon
• Argon + Hydrogen
• Argon/Helium

Helium is generally added to increase heat input (increase welding speed or weld penetration).  Hydrogen will result in cleaner looking welds and also increase heat input, however, Hydrogen may promote porosity or hydrogen cracking.

GTAW Welding Limitations

• Requires greater welder dexterity than MIG or stick welding
• Lower deposition rates
• More costly for welding thick sections

Common GTAW Welding Concerns

We can help optimize your welding process variables. Evaluate your current welding parameters and techniques.  Help eliminate common welding problems and discontinuities such as those listed below:

 

 

 

 

 

 

 

 

 

Weld Discontinuities

• Undercutting
• Tungsten inclusions
• Porosity
• Weld metal cracks
• Heat affected zone cracks

TIG Welding Problems

• Erratic arc
• Excessive electrode consumption
• Oxidized weld deposit
• Arc wandering
• Porosity
• Difficult arc starting

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MIG Welding

 

Gas Metal Arc Welding (GMAW) is frequently referred to as MIG welding.  MIG welding is a commonly used high deposition rate welding process.  Wire is continuously fed from a spool.  MIG welding is therefore referred to as a semiautomatic welding process.

 

MIG Welding Benefits

• All position capability
• Higher deposition rates than SMAW
• Less operator skill required
• Long welds can be made without starts and stops
• Minimal post weld cleaning is required

MIG Welding Shielding Gas

The shielding gas, forms the arc plasma, stabilizes the arc on the metal being welded, shields the arc and molten weld pool, and allows smooth transfer of metal from the weld wire to the molten weld pool.  There are three primary metal transfer modes:

• Spray transfer
• Globular transfer
• Short circuiting transfer

The primary shielding gasses used are:

• Argon
• Argon - 1 to 5% Oxygen
• Argon - 3 to 25% CO2
• Argon/Helium

CO2 is also used in its pure form in some MIG welding processes.  However, in some applications the presence of CO2 in the shielding gas may adversely affect the mechanical properties of the weld.

Common MIG Welding Concerns

We can help optimize your MIG welding process variables. Evaluate your current welding parameters and techniques.  Help eliminate common welding problems and discontinuities such as those listed below:

Weld Discontinuities

• Undercutting
• Excessive melt-through
• Incomplete fusion
• Incomplete joint penetration
• Porosity
• Weld metal cracks
• Heat affected zone cracks

MIG Welding Problems

• Heavily oxidized weld deposit
• Irregular wire feed
• Burnback
• Porosity
• Unstable arc
• Difficult arc starting

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Stick Welding

Shielded Metal Arc Welding (SMAW) is frequently referred to as stick or covered electrode welding.  Stick welding is among the most widely used welding processes.

The flux covering the electrode melts during welding.  This forms the gas and slag to shield the arc and molten weld pool.  The slag must be chipped off the weld bead after welding. The flux also provides a method of adding scavengers, deoxidizers, and alloying elements to the weld metal.

Stick Welding Benefits

• Equipment used is simple, inexpensive, and portable
• Electrode provides and regulates its own flux
• Lower sensitivity to wind and drafts than gas shielded welding processes
• All position capability

Common Stick Welding Concerns

We can help optimize your welding process variables. Evaluate your current welding parameters and techniques.  Help eliminate common welding problems and discontinuities such as those listed below:

Weld Discontinuities

• Undercut
• Incomplete fusion
• Porosity
• Slag Inclusions
• Cracks

Stick Welding Problems

• Arc Blow
• Arc Stability
• Excessive spatter
• Incorrect weld profile
• Rough surface
• Porosity