Characteristics, selection, use and maintenance of electric welder cables

First, a brief introduction of the welding machine cable

Electric welding machine cable, commonly known as welding wire, belongs to rubber insulated cable. It is a special cable used for secondary side wiring of electric welding machine and connecting electric welding tongs and electric welding machine. Its characteristics are: large current and low voltage. The jacket material is made of natural rubber or neoprene mixture, while the neoprene mixture jacket has heat resistance, oil resistance and non-flame retarding properties, so it can be applied to different occasions.

The welding machine cables are single-core cores, the conductors are all oxygen-free copper, the diameter of the copper wire is small, and the number of the wires is large. Generally, the copper wires are twisted into a strand, and then the strands are twisted into a conductor, so the welding machine cable The body is thicker and has hundreds of copper wires. The conductor is covered with a layer of heat resistant polyester film insulation. Type YH cable, insulated and sheathed into one layer, thicker than 1.8mm, the material is natural rubber mixture; type YHF cable has two kinds of covering, one is neoprene mixture, the other The rubber mixture is used as the insulation and the neoprene mixture is used as the sheath. Commonly used electric welding machine cable specifications are 16 square, 25 square, 35 square, 50 square, 70 square, 95 square, 120 square and so on.

Second, several characteristics of the welding machine cable

1. YH cable works under the condition of low voltage (highest voltage is 200V) and requires certain resistance.

2. The long-term allowable working temperature of the welding wire cable should not exceed 65 °C.

3. The motor lead cable is frequently moved, twisted and cast, requiring softness and good bending performance.

4. It is easy to be scratched and rubbed by sharp steel members during application, so it is required to have good mechanical properties such as cable insulation, tear resistance and wear resistance.

5. The use of environmental conditions is complex, such as sun exposure, water boiling, contact with muddy water, engine oil, acid and alkali liquid, etc., requires a certain weather resistance and oil and solvent resistance.

6. Sometimes it will encounter hot weldments, which require good heat deformation.

7. Always move, requiring a small outer diameter and light weight. Due to the low electrical performance requirements of such cables and the complicated environmental conditions, it is not suitable to meet various complicated environmental factors in the structure. Pay attention to improving the conditions of use to prevent external damage.

Third, the choice of welding machine cable

The primary power cord of the electric welder should not exceed three meters in length, and the cross-sectional area can take a current density of 4-6A per square millimeter. The following rated currents are 30-50A, 60-80A, 100A, 120-150A, 200A, 300A, 360-400A, respectively, 10 square millimeters, 16 square millimeters, 25 square millimeters, 35 square millimeters, 50 squares. Millimeter, 75 square millimeters, 90 square millimeters.

The welding cable can be YHH type rubber sleeve software cable for electric welding and special soft welding cable of YHHR type. When selecting a welding cable, it should be considered from the aspects of temperature rise and voltage drop. For the length below 20 meters, the influence of the voltage drop can be ignored, and only the current is selected, and the current density can be 4-10A per square. The selection of the cross-sectional area of ​​the welding cable for different currents of various lengths is listed below. Length 20 meters, 30 meters, 40 meters, 50 meters, 60 meters, 70 meters, 80 meters, 90 meters, 100 meters. 100A are 16, 25, 25, 35, 35, 50, 50, 60, 60 square millimeters; 150A are 25, 35, 35, 50, 50, 60, 60, 70, 70 square millimeters; 200A are respectively 25, 35, 35, 50, 50, 60, 60, 70, 70 square millimeters; 300A are 35, 50, 50, 60, 60, 70, 70, 85, 85 square millimeters; 400A are 50, respectively. 60, 60, 70, 70, 85, 85, 95, 95 square millimeters; 500A are 60, 70, 70, 85, 85, 95, 95, 120, 120 square millimeters; 600A are 70, 85, 85, 95, respectively. 95, 120, 120135, 135 square millimeters.

Fourth, electric welder cable use and maintenance

1. The device is non-repairable, and its various protective characteristics are specified by the manufacturer and cannot be adjusted at will;

2. If the arc welder is air-cooled and the main circuit has a contactor, connect the fan and contactor coil power supply to the input power terminal of the device;

3. Observe the status of the protector indicator before each use. The red light is the power indicator, and the green light is the safety voltage indicator. The normal state is: the green light is bright when it is not soldered, and it is extinguished when soldering. If it is found that the green light is not welded when the welder is not soldering If it is extinguished, it indicates that the protector has lost its protection and should be deactivated immediately.