Process for welding 800MPa high-strength steel without preheating
A high-strength steel and welding process technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of low-matching welding materials without preheating, etc., and achieve the advantages of reducing welding costs, improving crack resistance, and strong applicability Effect
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[0026] Example 1:
[0027] Base material: HG785 low-alloy quenched and tempered high-strength steel with a thickness of 30mm, butt joint (double-sided V-shaped groove, groove angle 45°), test plate size is 600mm×220mm×30mm.
[0028] Welding material: 600MPa and 800MPa gas shielded flux cored welding wire, diameter is 1.6mm.
[0029] Welding method: Ar+CO 2 Mixed gas shielded welding (using pulse welding power source), in which Ar and CO 2 The volume percentage is 80%:20%.
[0030] Welding process parameters: welding voltage 30V~32V, welding current 210V~230A, welding speed 0.4cm / s~0.5cm / s, welding input energy 15.8kJ / cm~18.4kJ / cm, shielding gas flow rate: 18~21L / min; The number of welding layers: 4 layers, the number of welding passes: 8, using multi-layer multi-pass welding.
[0031] Welding technical points: Welding is carried out at a room temperature of 24℃ without preheating. Before welding, mechanical and chemical treatments are used to clean the groove surface to remove oi...
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[0033] Example 2:
[0034] Base material: 25mm thick HQ80 low-alloy high-strength steel, box-shaped structure T-joint stiffener plate. The vertical plate of the T-shaped joint has a 45° single-sided V-shaped groove, and the size of the test plate is 400mm×220mm×20mm.
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