In CO2 gas shielded welding, the welding voltage provides the melting energy of the welding wire. The higher the voltage, the faster the welding wire melts; and the welding current is actually the balance between the wire feeding speed and the melting speed.
1
Welding current The welding current should be selected according to the welding conditions (plate thickness, welding position, welding speed, material and other parameters).
Therefore, the CO2 gas shielded welding current must match the welding voltage, and the wire feeding speed and welding voltage must be consistent in their melting ability to the welding wire to ensure the stability of the arc length.
For the same welding wire, the larger the cable, the faster the wire feeding speed. For the same current, the thinner the welding wire, the faster the wire feeding speed.
Xinfa welding equipment has the characteristics of high quality and low price. For details, please visit: Welding & Cutting Manufacturers – China Welding & Cutting Factory & Suppliers (xinfatools.com)
2
Welding voltage Welding voltage is arc voltage: it provides welding energy. The higher the arc voltage, the greater the welding energy, the faster the welding wire melts, and the greater the welding current.
The arc voltage is equal to the output voltage of the welding machine minus the loss voltage of the welding circuit, which can be expressed by the following formula: U arc = U output – U loss
If the welding machine installation meets the installation requirements, the loss voltage mainly refers to the voltage loss caused by the lengthening of the cable.
3
Setting welding voltage
Select the welding current of the corresponding plate thickness according to the welding conditions, and then calculate the welding voltage according to the following formula: <300A: welding voltage = (0.05×welding current + 14 ± 2) volts >300A: welding voltage = (0.05×welding current + 14 ± 3) volts
Example 1: Select welding current 200A, then the welding voltage is calculated as follows: welding voltage = (0.05×200+14 ± 2) = (10+14 ± 2) volts = (24 ± 2) volts
Example 2: Select welding current 400A, then the welding voltage is calculated as follows: welding voltage = (0.05×400+14 ± 3) = (20+14 ± 3) volts = (34 ± 3) Volts
4
The influence of welding voltage on welding effect
When the voltage is high: the arc length becomes longer, the spatter particles become larger, pores are easily generated, the weld becomes wider, the depth of solution and the residual height become smaller, and there is a “click! click!” sound.
When the voltage is low: the welding wire is inserted into the base material, the spatter increases, the weld becomes narrower, the depth of solution and the residual height become larger, and there is a “bang! bang! bang!” sound.
Wire feeding method: 1. Straight line method, straight line reciprocating method. (Suitable for small and narrow welds). 2. Sawtooth shape (suitable for wide welds), operation points: pause slightly on both sides of the weld, and the transition in the middle should be fast. 3. Crescent wire feeding method (same as sawtooth shape).
Post time: Nov-25-2024
