Wear PPE such as safety googles and gloves.

Please clear up scrap and wire clippings after spot welding; that will reduce the chance of detritus causing shorts in equipment or projects.

Never use the spot welder on equipment that is connected to the mains - always disconnect first.

The 709a is designed to be a battery welder but can be used for other duties that require strips of metal to be welded to other metal surfaces.

There are 2 switches on the top right, you need to flick the green switch (WELDING) to turn the machine on, to also use the soldering iron attachment you need to also flick the red switch (IRON).

In the middle there is a big red knob that lights up (SET CURRENT) this sets the power of the welder. Start low and build up, I was getting good welds with nickle strip as low as 2.

To the left is 3 buttons (PULSE), this sets how many pulses are sent to the welding tips. The default is 2 pulses (no lights on) and it goes up to 8. This is useful to make stronger welds at lower current. I was using the 4p setting and getting strong welds.

Below the SET CURRENT knob is the fixed welding head, this works by pushing against the probes upwards until it automatically pulses. This does not need the foot switch and is good for quick repetitive welds. The tension on the upwards force needed can be adjusted by a knob on the top of the machine.

To the right of the fixed welding head is the socket for the foot pedal, this is required if you need to weld using the welding pen.

To the left of the fixed welding head is the temperature setting knob (SOLDER) for the soldering iron, this is activated by the IRON switch.

To use the welding pen you need to make sure the pen is connected to the machine through the PA OUT sockets on the bottom right and that the foot switch is plugged in and in a comfortable position. Switch the machine on using the WELDING switch, the machine will light up and you can make your current and pulse setting if desired. Put pressure on the work with the 2 electrodes on the welding pen (they are like 2 copper pins), its important that both these pins have good contact with the piece you want to weld. When you are ready and in position depress the foot switch, the machine will click and you should weld. If you are getting sparking you need to hold the pen down straight and firm, also check your current settings as they may be too high.

Soldering iron part: Temperature: 150°C ~ 450°C Power:50 W Output Voltage:20 V DC Spot-welder part: Supply Voltage: AC 220 V Power: 1.5 KW (Instantaneous) Current: 500 A Electric leakage Switch Requirement: 60 A or more than 60 A Time of Double Pulse: 1 ~ 10 ms (adjustable) Time of Four Pulses: 2 ~ 20 ms (adjustable) Time of Eight Pulses: 8 ~ 80 ms (adjustable) Welding Pin Range: 5 - 6 mm Welding Pressure: 300 - 500 g Welding Distance: Adjustable Suitable Welding Thickness: 0.03 - 0.3 mm, Max. 0.2mm for welding pen

Cardboard box under soldering bench. The manual is in the small box on top of the spot welder with all the accessories and consumables. Please put back in box and place under the bench after use.

  • equipment/spotwelder
  • Last modified: 18 months ago
  • by markedwinpitt