Submerged-arc welding metal for high-strength pipeline
A weld metal, high-strength technology, applied in the field of weld metal and high-strength submerged arc weld metal, can solve the problem of unstable mechanical properties of welded joints, large fluctuations in weld metal B content, and affecting the qualified rate of finished steel pipes and other issues, to achieve excellent low-temperature impact toughness, improve pass rate, strength and stable low-temperature impact performance
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Embodiment 1
[0027] The welding test plate adopts the X100 grade pipeline steel plate with a thickness specification of 16.3mm. Double wire submerged arc welding is adopted on both sides, the welding heat input is 52kJ / cm, the welding speed is 2.0m / min, the groove is double Y-shaped, and the front and back sides are welded once. The solid core wire with a diameter of 4.0mm is selected, and the chemical composition is shown in Table 1; the flux is weakly alkaline sintered flux with a basicity of 1.35, and the flux is heated to 350°C and kept for 2 hours before welding.
[0028] After welding, the welded joints were inspected by X-ray and ultrasonic waves, and no defects were found. The chemical composition of the weld metal of the welded joint is shown in Table 2, and the test results of mechanical properties are shown in Table 3.
Embodiment 2
[0030] The same steel plate as in Example 1 was used. Three-wire double-sided submerged arc welding is adopted, the welding heat input is 60kJ / cm, the welding speed is 2.2m / min, the groove is double Y-shaped, and the front and back sides are welded once. Welding wire with a diameter of 3.2mm is selected, and its chemical composition is shown in Table 2; the flux is weakly alkaline sintered flux with an alkalinity of 1.38, and the flux is heated to 350°C and kept for 2 hours before welding.
[0031] After welding, the welded joints were inspected by X-ray and ultrasonic waves, and no defects were found. The chemical composition of the weld metal of the welded joint is shown in Table 2, and the test results of mechanical properties are shown in Table 3.
Embodiment 3
[0033]The welding test plate adopts the X100 grade pipeline steel plate with a thickness specification of 19.0mm. Three-wire double-sided submerged arc welding is adopted, the welding heat input is 65kJ / cm, the welding speed is 2.1m / min, the groove is double Y-shaped, and the front and back sides are welded once. Welding wire with a diameter of 4.0mm is selected, and its chemical composition is shown in Table 3; the flux is weakly alkaline sintered flux with an alkalinity of 1.33, and the flux is heated to 350°C and kept for 2 hours before welding.
[0034] After welding, the welded joints were inspected by X-ray and ultrasonic waves, and no defects were found. The weld metal composition of the welded joint is shown in Table 2, and the mechanical performance test results are shown in Table 3.
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