Precautions for argon gas injection in stainless steel argon arc welding
1. During argon arc welding, the back of the weld should be supplied with air in advance, and the flow rate should be appropriately increased. After the air is discharged, the flow rate gradually decreases. During the welding process, argon should be continuously filled into the pipe. When stopping welding, the gas is delayed to provide sufficient protection for the weld seam. It should also be noted that welding can only be carried out after the air is completely discharged, otherwise it will affect the protective effect of argon filling.
2. The argon flow rate should be appropriate. Low flow rate, poor protection, and easy oxidation on the back of the weld seam; Excessive flow can cause eddy currents to enter the air during welding, which can also deteriorate the protective effect and cause defects such as concave grooves at the root of the weld, affecting the welding quality.
3. The argon population should be placed as low as possible in the closed section, and the air outlet should be placed at the highest position in the closed section. Because argon is heavier than air, filling it from a lower position can easily ensure a higher concentration and better protection effect.
4. In order to reduce the loss of argon gas from the gap in the pipe, affect the protective effect, and increase costs, adhesive tape can be applied along the gap before welding, leaving only the length of continuous welding for the welder. The tape should be removed while welding.
The protection effect of argon arc welding can be judged by the color of the weld seam. When the weld seam is silver white or golden yellow, the best protection effect is achieved, followed by blue, followed by red and gray. If it is gray, the protection is poor, and if it is black, it indicates severe oxidation and the worst effect.
2. The argon flow rate should be appropriate. Low flow rate, poor protection, and easy oxidation on the back of the weld seam; Excessive flow can cause eddy currents to enter the air during welding, which can also deteriorate the protective effect and cause defects such as concave grooves at the root of the weld, affecting the welding quality.
3. The argon population should be placed as low as possible in the closed section, and the air outlet should be placed at the highest position in the closed section. Because argon is heavier than air, filling it from a lower position can easily ensure a higher concentration and better protection effect.
4. In order to reduce the loss of argon gas from the gap in the pipe, affect the protective effect, and increase costs, adhesive tape can be applied along the gap before welding, leaving only the length of continuous welding for the welder. The tape should be removed while welding.
The protection effect of argon arc welding can be judged by the color of the weld seam. When the weld seam is silver white or golden yellow, the best protection effect is achieved, followed by blue, followed by red and gray. If it is gray, the protection is poor, and if it is black, it indicates severe oxidation and the worst effect.
