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Micro TIG Welding: what is it and what can you do with it?

Posted by Mark Boyle on Tue, Jun 17, 2014 @ 02:07 PM

Miyachi America is best known for its resistance and laser welding technologies. To complement these well-established processes, Micro TIG welding was recently added to our product line. The Micro TIG process expands our process offering, particularly for materials such as copper. This blog veers away from our normal, application specific format to provide a quick introduction to the Micro TIG process:

  1. What is Micro TIG welding and how does it work?
  2. What materials can be welded and what are some typical applications?
  3. What equipment is needed?

 

What is Micro TIG and how does it work?  

Micro TIG (Tungsten Inert Gas) Welding, also known as Gas Tungsten Arc Welding (GTAW), is an arc welding process with a wide range of capability.  To create the arc, current is passed through a tungsten electrode to the grounded work pieces which creates significant heat and allows fusion of the two parts. An argon and/or helium cover gas is often used to allow the arc to form, as well as to shield the welding area from contaminants.  Micro TIG welders typically supply a current from 5 to 300 Amps with pulse durations of up to 4 seconds. Sometimes the pulse is divided into multiple mini-pulses by rapidly turning the current off and on. This feature,  called "pulsation," reduces the porosity of the completed weld nugget.

What materials can be welded with Micro TIG technology?

The Micro TIG welding process may be used to weld almost any material together, including, but is not limited to: stainless steel, copper, titanium, molybdenum, phosphor bronze, and tungsten.  Typical part sizes range from 100s of microns to millimeters in size.

Aluminum is the one material that cannot be easily welded via Micro TIG welding.

What are some typical Micro TIG suitable applications?

Applications for Micro TIG welding can be found in numerous industries – including Automotive, electronics, and battery industries.  In the automotive industry, typical applications include welding motor coils to terminal and welding PCB tabs together.  In the battery industry, applications include welding tabs to terminals (seen in far left) and tabs to bus bars.  

Micro TIG welding automotive applications

In the electronics industry, typical applications include balling wires, coil windings, and wire to tab welding.

Micro TIG applications, misc.

What equipment is needed to get started with Micro TIG welding?

The basic equipment required to do Micro TIG welding is shown in the image below. The Micro TIG welding power supply is the center of the set up. On the right hand side the torch stand, torch with electrode, and mounting location are shown. Due to the size of the parts and precise positioning required, torches are not hand held. The left-hand side of the picture shows the gas cylinder used for shielding gas.

MicroTIGkitDiagram noPartNumbers resized 600

Look for future blog posts in this forum for tip and tricks to develop good TIG welds.

And, as always, remember that Miyachi America provides free weld evaluations using Micro TIG welders in our applications lab. Since our labs are also equipped with our full range of metals joining technologies, we can perform comparative studies and offer you the best solution for your application while meeting your tough process and budget requirements.

Topics: tig welding, micro TIG welding

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