

Micro TIG weld
■ Fundamental
In the case of microarc welding, first of all, the workpiece (member to be welding) connected to the positive electrode of welder, a negative electrode of welder connected to the torch. Then applying high voltage to the workpieces, made between workpiece and welding torch through the air to form electric circuit. Following this, auxiliary high voltage circuit action, turns on the base current. At this time between welding torch and workpiece voltage as long as the low than the welder output voltage, the main current is turned on, the workpiece will be heated by arc heated and melted.
At the same time, argon gas is used as a protective gas. When using the argon gas in order to prevent welding oxidation and to maintain the stability of arc discharge. Sometimes using nitrogen instead of argon gas.
■ Basic Feature
1) Non-contact arc-welding way. Small parts can be no solder welding(completely lead-free),no pollution on the surrounding environment.
2) Because it is instant heating, little impact on the surrounding of heat, so can be small local welding.
3) Each solder joint processing time usually 0.1 second or less, high-speed automated processing can be performed.
4) Can weld the minimum diameter of thin lines is about 0.01 mm.
5) Compared with the solder welding, greatly improve the heat resistance of the welded part, but also greatly reduces the operating costs of production.
■ Weldability of Micro TIG Welding Materials

■ Tungsten Electrode Material

■ Welding System Constitution
■ Main Application
Micro-arc welding can be applied in the following industries. Various coil at the ends of the joint, electronic parts, motor winding, motor shell joint terminal, light bulbs, inductance coil, small electronic transformers, sensors, detectors, relay, thermocouple, precision medical equipment, precious metals, high melting point materials, dissimilar metal materials, etc.
In the case of welding the coil end, the terminal material is the most suitable for copper and phosphor bronze.
As long as it is using soldering handle material, can use microarc spot welding to implement the welding process.
■ Welding Examples
■ Comparison of Micro TIG welding and Soldering and YAG laser welding at coil welding application
Compared with solder welding, the Micro TIG Welding have little impact on the rest of the outside welds, don't appear like solder welding occurs when heat will spread to the welding department outside of the coil skeleton resin phenomenon. Moreover, also not produce soldering flux and lead and other issues. Laser welding is not only high operation cost, but also to the precision of the workpiece installation position requirement is very high. When the coil by laser welding, the wire is also vulnerable to burn out.