CO2 gas protection welding process of 800 MPa high-strength steel
A high-strength steel and welding process technology, applied in welding medium, welding equipment, welding equipment, etc., can solve the problems of high use cost of argon-rich mixed gas, increase welding production cost, and complicated welding process, so as to reduce welding cost , reduced welding performance, simple welding process
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Embodiment 1
[0018] Required material: HG785 low-alloy high-strength steel matching 800MPa strength-level solid welding wire with a diameter of 1.2mm. In this embodiment, the specification of HG785 low-alloy high-strength steel is 8mm, and the chemical composition of 800MPa strength-level solid welding wire with a diameter of 1.2mm Weight percentage is C: 0.04, Si: 0.30, Mn: 1.30, Ni: 0.40, Cr: 0.20, Mo: 0.20, Cu: 0.30, Ti: 0.05, B: 0.002, P: 0.005, S: 0.005, Als: 0.005 , the balance is Fe and unavoidable impurities.
[0019] Joint processing: the butt joint adopts X-shaped bevel, the bevel angle is 55°, the blunt edge is 1mm, the assembly gap is 1mm, the size of the test plate is 500mm×150mm×8mm, and the joint surface with a width of 50mm is polished with a grinder.
[0020] Set welding mode: use CO 2 Gas shielded welding and DC power reverse connection method, in which the welding current is 300A, the arc voltage is 32V, the welding speed is 30cm / min, and the gas flow rate is 20L / min. ...
Embodiment 2
[0024] This embodiment is basically the same as Embodiment 1, except that the specification of HG785 low-alloy high-strength steel is 16 mm, and the chemical composition weight percentage of 800 MPa strength level solid welding wire with a diameter of 1.2 mm is C: 0.07, Si: 0.55, Mn: 1.65, Ni: 0.70, Cr: 0.35, Mo: 0.40, Cu: 0.55, Ti: 0.125, B: 0.006, P: 0.010, S: 0.0075, Als: 0.015, and the balance is Fe and unavoidable impurities.
[0025] In the joint processing step, the blunt edge is 1.5mm, the assembly gap is 1.5mm, and the size of the test plate is 500mm×150mm×16mm.
[0026] In the step of setting the welding category, the welding current is 315A, the arc voltage is 33.5V, and the welding speed is 32cm / min.
Embodiment 3
[0028] This embodiment is basically the same as Embodiment 1, except that the specification of HG785 low-alloy high-strength steel is 25 mm, and the chemical composition weight percentage of 800 MPa strength level solid welding wire with a diameter of 1.2 mm is C: 0.10, Si: 0.80, Mn: 2.0, Ni: 1.0, Cr: 0.50, Mo: 0.60, Cu: 0.80, Ti: 0.20, B: 0.010, P: 0.020, S: 0.015, Als: 0.03, and the balance is Fe and unavoidable impurities.
[0029] In the joint processing step, the blunt edge is 2mm, the assembly gap is 2mm, and the size of the test plate is 500mm×150mm×25mm.
[0030] In the step of setting the welding category, the welding current is 330A, the arc voltage is 35V, and the welding speed is 34cm / min.
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