Stainless Steel Pipe TIG + MAG welding

 Case Study 1

0Cr18Ni9 bassoon φ530mm × 11mm stainless steel all position levels fixed butt joint oil pipeline is mainly used for power plants, welding more difficult, requiring high quality of welded joints, forming the inner surface required well, moderate bulge after welding requires PT , RT test. TIG welding are used in the past or manual arc welding, the former low efficiency, high cost, which is difficult to guarantee quality and low efficiency. To ensure both the quality and efficiency, the use of TIG, the outside bottom of filler wire welding method, MAG welding fill and cover surface, the quality and efficiency are guaranteed.

0Cr18Ni9 stainless steel thermal expansion, electrical conductivity and the rate of carbon steel and low alloy vary greatly, and the pool of liquidity is poor, poor shape, especially in the all-position welding is more prominent. In MAG welding process, the extended length of wire must be less than 10mm, torch oscillation amplitude, frequency, speed and dwell time with the right edge, concerted action, at any time adjust the torch angle to the surface of the edge of the weld fusion neat, beautiful shape, with ensure the quality of filling and cover the surface layer.
wire cable tray systems, cable tray prices, galvanized cable tray
2 welding methods and welding preparation

2.1 Soldering Methods

Material for the 0Cr18Ni9, pipe specifications for φ530mm × 11 mm, rendering the use of manual GTAW, gas mixture (CO2 + Ar) welding filling and capping, stand up to the level of fixed-position welding.

2.2 pre-welding

2.2.1 clean up the oil, rust and other dirt, the groove surface and within the repair 10mm milled around the metallic luster.

2.2.2 Check the water, electricity, gas and road is smooth, equipment and accessories should be in good condition.

2.2.3 according to size for assembly, tacking the use of rib plate (2:00, 7:00, 11:00 for the positioning block fixed), and points can be fixed within the groove, but must pay attention to positioning of welding quality.

2.2.4 tube filled with argon protection.
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