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Welding precautions of the stainless steel pipe

Aug. 21, 2019
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Welding precautions of the stainless steel pipe shared by Weld Steel Pipe Supplier China.

It started with the rise of bicycle manufacturing. The development of petroleum in the early 19th century, the manufacture of ships, boilers and airplanes during the two world wars, the manufacture of thermal electric boilers after the second world war, the development of chemical industry and the drilling, extraction and transportation of stone, oil and natural gas all strongly promoted the development of steel tube industry in variety, output and quality.

1. Adopt the power source with vertical external characteristics, and adopt the positive polarity (welding wire to negative electrode) for dc.

2. Generally suitable for the welding of thin plates under 6mm, with the characteristics of beautiful welding seam formation and small welding deformation.

3. The shielding gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon flow is 8~0L/min, and when the current is 50~250A, the argon flow is 2~5L/min.

4. The length of the tungsten electrode protruding from the gas nozzle is 4~5mm, which is better. It is 2~3mm in areas with poor shielding such as fillet welding, and 5~6mm in places with deep grooves.

Galvanized Welded Steel Pipe

Galvanized Welded Steel Pipe

5. In order to prevent the appearance of welding holes, rust and oil stains must be cleaned on the welding parts.

6. The arc length of welding is 2~4mm for common steel, and 3mm for stainless steel, but too long is not good for protection.

7. Gas protection shall be implemented on the back of the bottom pass to prevent oxidation of the back of the bottom pass during butt laying.

8. In order to protect the welding pool with argon gas and facilitate welding operation, the Angle between the center line of tungsten pole and the workpiece at the welding place should be maintained at 80~85°, and the included Angle between the filler wire and the surface of the workpiece should be as small as possible, usually around 0°.

9. Windbreak and ventilation. In windy areas, take precautions to block the net, and take proper ventilation measures indoors.

We supply Welded Steel fluid pipe, Galvanized Welded Steel Pipe, etc., welcome to purchase our steel pipes.