Selection of welding cables

Welding cable refers to the connection machine a primary side coil and a holder, earth clamp to form the welding circuit cable.

In order to make the welding operation convenient and flexible, soft welding cable should be used, especially near the welding area of 2 ~ 3m. The wire should be as far as possible to choose soft cable. If the welding fixed locations, you can also choose hard wired for the ground, but must not available iron, iron frame take, otherwise, not only a waste of a large amount of electric energy, may also for ground pressure drop is too large to affect welding performance. In our country cable products, there are special types of YHH welding with rubber soft cable and YHHR type special soft welding cable

Welding cable length, mainly according to the need to determine the production. Members of the large-scale welded or in order to expand the scope of work of the welder can be appropriately extended welding cable, but it should be noted that, with the growth of welding cable, its resistance value increases, and power loss also increases. For example, the cross-sectional area of the 60mm2 cable, if the load current is 300A. When the total length is 40m, the power loss is 1.15kW. When the total length of the cable is increased to 8Om, the power loss is increased to 2.3kW. Therefore, from the point of view of energy saving, the shorter the better the welding cable.

In addition, the welding current through the welding cable also produces a larger voltage drop, which will lead to a decrease in the welding current. Therefore, the voltage drop on the welding cable should be used to limit the no-load voltage to 5% (i.e., no more than 4V). For the site installation welding, the welding location is far, near, high, and low, and can be used by the method of the sub-extended welding cable. The joint cable ends and about 10m installed can be fastened, welding is lengthened or shortened according to the requirement.

The choice of welding cable section should be taken into account the temperature rise (current) and the pressure drop 2 factors. The welding cable with the length of 2Om can be neglected, and the effect of the pressure drop can be neglected, and only the size of the weld in the load is chosen. On the YHH cable, when the length of the 20m above, the current density is generally desirable 4 - 10 Am. When using the thicker cable, a smaller current density should be taken. When the welding cable length exceeds 50m, in addition to the temperature rise, it is also necessary to press the pressure drop is not more than 4V. For example, for the following length of 20mm welding cable, when the welding current of 300A, the load duration is 60%, then the 300Ax60%=300Ax0.78=234A current to select the welding cable. If the current density is mm2 / 7A, the cable cross-section should be 7A / 234A / mm2=33.4mm2. You can use the YHH-35 type rubber sheathed soft cable.