A self-shielded flux-cored wire suitable for pipeline steel welding
A technology of flux-cored welding wire and self-protection, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of poor low-temperature toughness, many pores and splashes, and large smoke and dust, and achieve high low-temperature impact toughness, Reduces spattering and even coverage
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[0016] According to the specific welding pipeline steel, the flux core powder is prepared according to the components in Table 1, and after drying at 120-300 °C, it is mixed evenly and added to the cold-rolled steel strip at a filling rate of 18-22%. In the welding wire for the outer skin.
[0017] Table 1 Flux cored wire components and mass percentage (%)
[0018]
[0019] The test materials are X60, X65, X70, and the size of the test plate is 300×150×20mm. According to the "Materials and Welding Specifications" of China Classification Society, the Y-shaped groove is processed, and the multi-layer and multi-pass welding method is adopted. After the front side is surfacing and the back is cleaned, there is one welding, and the non-pulse constant voltage power supply is used for DC positive connection. The V-notch impact specimens of welded joints were prepared according to the "Code for Materials and Welding" of China Classification Society. The size of the impact sample ...
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