Outline
- Page 1
- 1.0 Resistance Welding
- 1.1 Time Effect
- 1.2 Weld Pressure
- Page 2
- 1.3 Weld Power Supplies
- 1.31 Synchronous AC Supply
- 1.32 Capacitive Discharge Power Supply
- Page 3
- 1.4 Dumet To CCFE (Copper Clad Iron)
- 1.5 Pressed and Sintered Tantalum to Tantalum Wire
- Page 4
- 2.0 Precussive Welding
- 2.1 Applicability of Percussive Welding
- 2.2 Design of Work Pieces
- 2.3 Percussive Weld Power Supplies
- Page 5
- 2.4 Arc Time and Heat Affected Zone
- 2.5 Welding Energy
- 2.6 Welding Force
- 2.7 Arc Starting
- 2.8 Progress of the Percussive Weld
- Page 6
- 2.9 Control of Parameters
- 2.9.1 Welding Current
- 2.10 Molybdenum to Zirconium Copper
- 2.11 Tantalum Welding for Capacitors
- 2.12 Nickel Wire to Tantalum Anode Riser Wire
- Page 7
- 3.0 Glossary of Terms
- Page 8
- 4.0 Advantages and Disadvantages of Resistance Welding and Percussive Welding
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Hadley, PA USA 16130
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Resistance and Percussive Arc Welding - page 2
1.3 Weld Power Supplies
A variety of different weld power supplies are available for resistance welding.
There are four basic categories: STORED ENERGY CAPACITIVE DISCHARGE,
SYNCHRONOUS AC, HIGH FREQUENCY DC AND PURE DC WELDER.
1.31 Synchronous AC Supply
A typical example is shown in the block diagram of Figure 2. It consists of a power circuit capable of switching both halves of the AC line voltage (Fig. 2A), a zero voltage detection circuit for synchronizing switching of the power circuit, a timing circuit to trigger the power circuit for the desired amount of weld time, and a welding transformer to convert high voltage at low current to low voltage (commonly 2 to 6 volts) at high current.
The output of a synchronous AC power supply is normally adjustable in three ways, as depicted in Figure 3 (below):
- Heat Setting – Controls the percentage of each half cycle line voltage applied to the weld transformer, as referenced from the zero crossing point of the AC voltage. (Figure 3A)
- Half or Full Cycle – Sets the power supply to deliver consecutive half cycles of line current of the same polarity or of alternating polarity. Full cycle will deliver at least one full cycle of line current. (Figures 3B and 3C)
- Number of Cycles – Sets the number of cycles of line current delivered for every welder firing. (Figure 3D)
1.32 Capacitive Discharge Power Supply
A typical circuit is shown in Figure 4 (below). The capacitor(s) are charged by direct current from a rectifier or generator. This welding energy is stored at from 50 to 300
VDC and later discharged through either mechanical or electrical switching methods into the primary of a high current welding transformer.
The controls for this weld power supply are:
- Voltage Applied – An adjustment to voltage stored in the capacitors.
- Amount of Capacitance – An adjustment of the number of capacitors.
- Weld Current – An adjustment of the taps on the welding transformer to vary the voltage on the secondary winding.
Next: Resistance and Percussive Arc Welding - page 3