• PRECISE CONTROL OF OUTPUT VOLTAGE AND WELD TIME PROVIDE CONSISTENT REPEATABLE WELD ENERGY
• 16 BIT MICROPROCESSOR
• CONSTANT VOLTAGE WITH FEEDBACK TIME LESS THAN 10µ SECONDS
• WELD TIME 10µ SECONDS TO 9.99 MSEC.
• INCREASED STRENGTH AND DUCTILITY BETWEEN THE WELDMENTS
• FINISHED PRODUCTS WITH NUGGETS OF EQUAL SIZE AND STRENGTH
• ELIMINATION OR MINIMIZED DISCOLORATION OF WELD MATERIALS
• PRE-PULSE RESISTANCE CHECK AND AUTOMATIC VOLTAGE COMPENSATION.

Steep rise of welding voltage enables a very short welding time producing:
Stronger, more ductile weld joints - Little discoloration or deformation
Minimal arcing and splash - Minimal fluctuation in current balance
Ability to weld foils and very fine wires with excellent results

Adaptive controls of critical rise voltage provides stabilized energy output in less than 15µseconds.

Pre-pulse feature allows the measurement of the resistance between the weldments and the comparison with present parameters before welding.

This provides the following benefits:
Activation of the compensation mode when the resistance is within the set parameters.
Interruption of the weld when resistance is outside the set parameters & compensation range.
Increased life of the electrodes.

Calibration accuracy of +/-20 millivolts provides for consistent performance from unit to unit.

Current or Voltage waveform display for monitoring and troubleshooting:
Monitors the entire waveform including the critical rise time

Compensation Function Allows:
Establishment of an optimum welding condition
Compensation for variations of contact area, plating thickness or part cleanliness
Weld voltage is increased/decreased when contact resistance is within the present parameters
Constant voltage to be maintained (even when the work pieces vary)

Built in Functions:
Resistance check pre-monitor - Welding monitor
Current wave form monitor - 8-weld schedule module - Trace monitor function

Optional RS 232 Data Output:
Counter - Voltage - Current - KVA - GOOD/NG Evaluation - Warning - Schedule - Time

APPLICATIONS FOR LINEAR DC WELDING:

Medical Devices - Conventional and Lithium Ion Battery Pack Assembly
Lamp Components - Consumer Appliances - Small Parts or Thin Foils
Highly Conductive Materials requiring fast rise and short weld time.

LINEAR DC POWER SUPPLY

Seiwa Linear DC welders deliver a highly controlled form of stored energy. The term Linear DC refers to the ability of the control system to produce an output which changes in direct proportion to changes in resistance at the weld joint. To produce this type of output, a fast response time is required by the control system. (Approximately 5-10µS)

Advantages of using a Linear DC for welding fine wires & thin foils.

Superior strength, ductility, and low deformation in thin foils and fine wires (.010" and below) is achieved by utilizing a very short, high current welding pulse. A short weld pulse limits heat stress, size of the heat affect zone and minimizes oxidation. The key to achieving repeatability is maintaining a consistent heating process (heat balance) from the beginning of the weld cycle through setting the nugget. Seiwa Linear DC provides fast response time required for measuring voltage at the weldments, and changes output so that heating is consistent even at very short weld times.

Other features, which enable the Linear DC unit to maintain proper heating, include resistance check and pre-pulse functions. Resistance check measures combined resistance and when combined with automatic voltage compensation adjusts control circuitry, providing proper output based upon measurement. This process continues throughout the weld to detect changes in resistance and ensure proper heating. Pre-Pulse function burns off oxides, which build up due to exposure to elements and provides a clean work surface.

Seiwa products from MTI MicroWelding are designed and built using production experience and customer feedback . MTI is committed to work in partnership with customers to solve a variety of process challenges and guarantee the highest quality in all of our products and technical services.