CO2 gas protection welding process of 800 MPa high-strength steel

A high-strength steel and welding process technology, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of complicated welding process, increased welding production cost, and high cost of using argon-rich mixed gas, so as to achieve simple welding process, Reduced welding performance and reduced welding cost

Inactive Publication Date: 2011-09-14
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the welding process of these two welding methods is complicated, welding requires preheating, post-heating or post-welding heat treatment, and the cost of using argon-rich mixed gas is also high. Taking the price of 40L gas as an example, the cost of argon-rich gas is 1,000 yuan Left and right, this undoubtedly increases the welding production cost, these are the problems existing in the existing welding method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a CO2 gas protection welding process of 800 MPa high-strength steel. The CO2 protection welding process is characterized by comprising the following steps of: (1) machining a joint: machining an X-shaped groove on the joint; (2) using a solid welding wire with the diameter of 1.2 mm and the tensile strength of 800 MPa, wherein the solid welding wire comprises the following chemical components in percentage by weight: 0.04-0.10% of C, 0.30-0.80% of Si, 1.30-2.0% of Mn, 0.40-1.0% of Ni, 0.20-0.50% of Cr, 0.20-0.60% of Mo, 0.30-0.80% of Cu, 0.05-0.20% of Ti, 0.002-0.010% of B, less than and equal to 0.020% of P, less than and equal to 0.015% of S, less than and equal to 0.03% of Als, and the balance of Fe and inevitable impurities; (3) setting a welding mode: adopting CO2 gas protection welding and a DC power supply opposition method; and (4) welding: carrying out one-side welding with back formation on a first welding line, and then carrying out multilayer multipass welding, wherein interlayer temperature is less than and equal to 160 DEG C. The invention has the advantages of simple process, high operability and low welding energy consumption and welding cost and can be widely used for the technical fields of the gas protection welding of the high-strength steel.

Description

technical field [0001] The present invention relates to the technical field of high-strength steel gas-shielded welding, in particular to a gas-shielded welding process for high-strength steel, specifically a CO welding method for 800MPa high-strength steel 2 Gas shielded welding process. Background technique [0002] The use of high-strength steel has many advantages, including weight reduction, cost reduction, and easy processing and transportation. Therefore, high-strength steel is widely used in construction machinery, electric power, pressure vessels, automobiles and other fields. Higher strength and higher toughness and plasticity are important factors to promote the development of high-strength steel. Among them, welding performance is a crucial factor affecting the popularization and application of high-strength steel. Therefore, timely and effective solutions to the weldability of high-strength steel, supporting welding materials and welding processes are conduciv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K35/362
Inventor 陈浮黄治军缪凯刘吉斌胡家国刘昌明
Owner 武钢集团有限公司
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