What are the precautions for the use of resistance spot welding machine?

resistance spot welding machine ?

Sturt technology resistance spot welding machine refers to a welding equipment that uses the principle of resistance heating to weld. Resistance spot welding machine can be divided into different types according to different uses and requirements. From the classification of welding methods, there are spot welding machine, seam welding machine, projection welding machine and butt welding machine.

According to the pressure form of the electrode, there are lever type, electric cam type, pneumatic type, hydraulic type and air and hydraulic combination type. According to the classification of welding current of resistance spot welding machine, there are single-phase power frequency welding machine, secondary rectifier welding machine, three-phase low-frequency welding machine, capacitor energy storage welding machine and inverter power welding machine. The resistance welding machine is mainly composed of the main circuit part, the pressure transmission part and the control part. Precautions for the use of

resistance spot welding machine:

(1) Precautions for welding electrodes

electrode materials are commonly made of aluminum oxide copper (red copper), cadmium bronze, chromium bronze, tungsten alloy, etc.

electrode has various shapes, which are mainly determined according to the shape of weldment.

When the electrode is mounted, pay attention to the parallel appearance of the upper and lower electrodes.

electrode stereo should be kept clean, and emery cloth or file should be used for trimming.

(2) Welding Process Considerations

Welding Cycle The welding cycle for spot welding and projection welding consists of four fundamental stages (spot welding process).

Pre-pressing stage-the electrode is lowered to the current on stage to ensure that the electrode is pressed against the workpiece so that there is proper pressure between the workpieces.

welding stage-welding current through the workpiece, resulting in high temperature to form a nugget.

maintenance phase-cut off the welding current, the electrode pressure is continuously maintained until the nugget condenses to sufficient strength.

Inactivity Phase-The electrode begins to lift until the electrode begins to descend again, beginning the next weld cycle.

(3) In order to improve the function of the welded joint, it is sometimes necessary to add one or more of the following items to the welding cycle:

Increase the pre-pressure to eliminate the gap between thick workpieces and make them fit tightly;

Use preheating pulse to improve the plasticity of the metal, making the workpiece easy to fit tightly and avoid spatter;

Adjust current or welding time, is the welding workpiece to achieve the ideal welding effect;

projection welding when doing so can make multiple bumps in the electric welding before the average contact with the flat plate, to ensure that the differences between the heating points.

resistance spot welding machine welding method-spot welding

spot welding is to assemble the weldment into a lap welding head, and press it between two cylindrical electrodes, and use resistance heat to melt the base metal to form a solder joint Resistance welding method. Spot welding is mainly used for welding sheet, wire, hardware and other products. Spot welding process:

(1) pre-press to ensure good contact with the workpiece.

(2) is energized to form a nugget and a plastic ring at the weld.

(3) Power-off forging, so that the nugget continues to cool and crystallize under pressure, forming a compact structure, no shrinkage cavity, crack solder joint.