Gas shielded welding is a method of arc welding that utilizes gas protection. It can melt and connect metal materials under high temperature and pressure conditions. The advantages of gas shielded welding are fast welding speed, good weld quality, simple operation, and low equipment cost. However, gas shielded welding also has some common problems, one of which is gas leakage from the welding gun.

Welding gun leakage refers to the leakage of protective gas from the welding gun where it should not leak during the welding process, resulting in a decrease in protective effect and even affecting the stability of the arc and the formation of the molten pool. Leakage of the welding gun can cause the following adverse consequences:

Reduced welding quality. Due to insufficient or uneven protective gas, the surroundings of the molten pool are prone to erosion by elements such as oxygen and nitrogen in the air, resulting in defects such as oxidation, embrittlement, and porosity.

Reduced welding efficiency. Due to unstable arc or incomplete molten pool, it is necessary to increase current or extend welding time, consuming more energy and materials.

Reduced welding safety. Due to the leakage of protective gas, it may cause sparks, splashes, smoke, and other phenomena, posing a threat to the environment and human health.

So, what are the reasons for welding gun leakage? According to different parts, it can be divided into the following types:

Poor sealing of welding gun: The sealing components of the welding gun may age, wear or damage, leading to gas leakage. For example, sealing rings or gaskets between nozzles and conductive nozzles, between conductive nozzles and insulation sleeves, between insulation sleeves and connectors, etc.

Welding gun damage: Some components of the welding gun may deform, crack, or break, leading to gas leakage. For example, nozzles,Metal or ceramic materials at conductive nozzles, insulation sleeves, connectors, etc.

Welding gun blockage: Some components of the welding gun may become blocked or blocked, resulting in abnormal gas flow. For example, splashes or impurities inside nozzles, conductive nozzles, connectors, etc.

Improper installation of welding gun: Some components of the welding gun may not be installed or tightened in place, resulting in gas leakage. For example, the degree of tightening or alignment between nozzles and conductive nozzles, between conductive nozzles and insulation sleeves, between insulation sleeves and connectors, etc.

So, how to solve and prevent the problem of welding gun leakage? According to different reasons, the following methods can be adopted:

Regular inspection and replacement of seals: Check whether the sealing ring or gasket is intact, meets the specifications, and has any looseness or slipping. If any problems are found, replace them with new seals in a timely manner to ensure the sealing performance of the welding gun.

Regular inspection and repair of welding guns: Check for deformation, cracks, or fractures in components such as nozzles, conductive nozzles, insulation sleeves, and connectors, as well as looseness or detachment. If problems are found, promptly repair or replace damaged components to ensure the integrity and stability of the welding gun.

Regularly clean and ventilate the welding gun: Clean the splashes or impurities inside the nozzle, conductive nozzle, and connector to prevent blockage or blockage of the gas path. Tools such as wire brushes and compressed air can be used for cleaning to ensure the smoothness of the gas.

Correct installation and adjustment of welding gun: Install and adjust the nozzle, conductive nozzle, insulation sleeve, connector and other components correctly according to the requirements of the specifications, so that they fit tightly and have no gaps or leaks. Tools such as wrenches and calipers can be used for installation and adjustment to ensure the accuracy and consistency of the welding gun.

SUMMARY

Gas leakage from the gas shielded welding gun is a common welding problem that can affect the quality, efficiency, and safety of welding. The reasons for welding gun leakage include poor sealing, damage, blockage, and improper installation. The methods to solve and prevent welding gun leakage include inspecting and replacing seals, inspecting and repairing welding guns, cleaning and ventilation of welding guns, and correctly installing and adjusting welding guns. I hope this article can provide you with some useful information and references. Thank you for reading!