Gas protecting device for welding

Abstract

The invention relates to a gas protecting device for welding. An operating hole, a gas hole, a sight glass and the like through which staff can perform welding conveniently are arranged. The gas protecting device is characterized in that a workpiece and outside air are totally isolated through the whole device, and a welding area is isolated from workers. Due to the structure, not only can existence of hydrogen in a welding joint be effectively suppressed and hydrogen holes and cracks be prevented, but also harmful effects of nitrogen in air on molten drops and metal of a molten pool can be effectively prevented. Due to the structure, harm to operators can be reduced, and a tidy and high-quality welding bead uniform in clarity and smooth in surface can also be obtained. The gas protecting device is particularly suitable for welding needing gas protection, simple in structure, convenient to manufacture and maintain, economical and practical.

Description

technical field [0001] The invention relates to a protective device, in particular to a gas protective device for welding. Background technique [0002] We know that various welding methods have been widely used in chemical machinery, pressure vessels, automobiles, shipbuilding, engineering machinery, aerospace and other fields. However, gas shielded welding often has poor gas shielding, so that the air erodes the molten pool and causes the weld metal to be oxidized, and the weld area cannot be effectively isolated from the air, so that the weld area cannot be protected, resulting in holes and other defects , so that the weld strength, corrosion resistance and other properties are greatly weakened, so that good welding quality cannot be obtained. Even make some weldments of expensive materials invalid. And the light radiation in the welding process and the harmful gas produced have certain harm to the human body. Therefore, when performing gas shielded welding, it is nece...

AI Technical Summary

Problems solved by technology

However, gas shielded welding often has poor gas shielding, so that the air erodes the molten pool and causes the weld metal to be oxidized, and the weld area cannot be effectively isolated from the air, so that the weld area cannot be protected, resulting in holes and other defects , so that the weld strength, corrosion resistance and other properties are greatly weakened, so that good welding quality cannot be obtained

Even void weldments of some expensive materials

Moreover, the light radiation and harmful gases produced during the welding process are harmful to the human body.

Images