How to choose the right welding electrode for the welding machine?

16-04-2019

How to choose the right welding electrode for the welding machine?


The main problem of manual arc welding machine selection

At present, the manual arc welding machine on the market is full of dazzling, old-fashioned AC welding machine, silicon rectifying DC welding machine, inverter DC welding machine. The first welding machine has many varieties and specifications, many brands, and the quality is not good. Faced with so many welders, how to choose a product that is both economical and practical?

To choose a manual arc welder, you must understand the simple common sense of the following welders.

Positive connection method: the positive electrode of the workpiece welding machine in the welding process is the positive connection method, and the normal welding acid electrode is positively connected.

Reverse connection method: the negative electrode of the workpiece welding machine in the welding process is reverse connection method, and the basic electrode and stainless steel welding rod are generally reversed.

Load continuation rate: Generally speaking, the welding machine hits the maximum welding current (rated current). The working time is 10 minutes. The working 6 minutes rests for 4 minutes. The welding machine is just not protected and not damaged. The load continuation rate is 60%. The duty cycle of civil welding machines on the market is mainly 35% and 60%. A welder below 100% duty cycle cannot weld for a long time at rated current. The relationship between the load continuation rate and the long-term large amount of welding current is as follows:

Load duration = long time maximum welding current 2 / rated current 2

Take a 400A load duration of 35% welder as an example: 0.35 = long time maximum welding current 2/4002

That is: the maximum welding current can be 236.63A for a long time. In other words, this 35% load duration 400A welder can only work at the current of 236.63A to achieve 100% continuity.

The relationship between the welding electrode diameter and the welding current: the current of the welding rod = the diameter of the welding rod * 40

For example, the welding current required for the 4.0 electrode is 4.0*40, then the 160A current is the optimum current value for the welding 4.0 electrode. However, in actual work, there will be certain changes due to factors such as material, workpiece size, and efficiency.

welding wire

Get the latest price? We'll respond as soon as possible(within 12 hours)