Thermocouple Welder - TCW


  • Argon Gas Weld Chamber
  • Easy to Use
  • Designed to Operate Either in a Production or Laboratory Environment
  • Weld Fire Lockout
  • Line Voltage Regulator
  • Wire Gauge Selection from 38 AWG to 20 AWG


The Miyachi Unitek TCW thermocouple welder welds thermocouple wires together to form a uniform bead junction, consistent in size and quality, without detrimental oxide layers. The TCW will make thermocouples of all commercially available thermocouple alloys.


Specifications :

Quality Control Features

Weld Chamber

Argon gas flowing through the weld chamber ensures a reliable, oxide-free weld.

Firing Circuit

Prestripped wire must be properly loaded into the handpiece and the handpiece correctly inserted into the weld chamber to initiate firing.
This loading sequence ensures that the handpiece is double earth grounded for maximum operator safety. Internal filtering prevents false firing due to radio frequency interference.

Weld Fire Lockout

Prevents poor welds caused by attempting a weld before the capacitors recharge. This condition exists immediately after a weld has been
made or the control has been reset.

Line Voltage Regulator

Maintains the capacitor bank voltage within ±0.25% of setting for a ±13% change in line voltage. This feature ensures consistent
thermocouple weld quality.

Line Failure Turndown

Welder automatically activates the turndown circuit, discharging the capacitor bank when the line voltage is interrupted. This circuit en-
sures consistent welds and protects the operator from inadvertent discharge.




Power Switch

Disconnects both sides of the input power line when switched to the “OFF” position.

Weld Ready

Indicates that the capacitor bank has fully recharged and is ready to make a weld.

Wire Gauge Selection

Controls the level of stored energy necessary to make a thermocouple weld. Energy levels are indicated for each American Wire Gauge
(AWG) from  38 AWG to 20 AWG. Because of variations in he melting characteristics of thermocouple alloys, it may be necessary to in- crease or decrease the Wire Gauge Selection setting to produce the optimal thermocouple weld. This control may also be used to increase or decrease the size of the weld bead to suit specific requirements. Four Wire Clamp Jaw Assemblies are available for use with different gauge wires. Specify wire gauge range upon ordering.



Solid State Circuitry

Components conservatively rated when used within the maximum specified repetition rates. The charging circuit uses thyristors in a
unique manner to provide high reliability and precise charging intervals.

Operating Voltages and Currents

115V/0.5A, 230V/0.3A, or 100V/0.5A at 50/60 Hz

Standby Power

Approximately 15 watts

Stored Energy Rating

Range 3 to 190 watt-seconds (joules)

Capacitor Bank

18,300 MFD ±10%  at 20° C. Three capacitors are grouped in a single bank. At full rating, the capacitor bank is operated at 144 volts.

Welding Speed

As a manual feed thermocouple welder, the maximum number of welds per minute is determined by how fast the handpiece can be
loaded and inserted into the weld chamber. The actual weld time is less than .1 seconds, and the time for the circuitry to recharge is 3 seconds maximum.

Argon Gas Flow

Recommended flow rate is 3 cubic feet per hour.

Argon Gas Shutoff

Blocks the flow of argon gas to the weld chamber when line voltage is turned off.


Physical Characteristics

Power Supply

Inches (cm)


Inches (cm)


6.875 (17.5)

Body Length:

4 (10.16)



10.25 (26.0)

Body Diameter: 0.75 (1.91)



10 (25.4)

Wire Clamp Length: 0.75 (1.91)



Wire Clamp Diameter:

0.25 (.064)


16.2 lbs (7.3 kg) (Includes handpiece)


0.2 lbs (91 gm)


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