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High-strength bridge steel-gas protective welding method

A protection welding, high-strength technology, applied in the direction of welding equipment, arc welding equipment, workpiece edge, etc., can solve the problems that hinder the promotion and application of bridge steel and new steel types, and achieve excellent welding process performance, easy operation, and excellent low temperature The effect of impact toughness

Inactive Publication Date: 2009-02-18
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the weldability of long-span bridge steel grades and the supporting welding materials and welding process problems are not solved in a timely and effective manner, it will directly hinder the promotion and application of bridge steel and new steel grades in my country.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Base material: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 50mm+50mm; the mechanical properties of the steel plate with a thickness of 50mm are: yield strength R eL : 510MPa, tensile strength R m :645MPa, elongation rate A: 21%, impact energy A at -40°C KV :180J. The size of the test plate is 600mm×400mm×50mm, and the gas shielded welding groove adopts a double-sided V-shaped symmetric groove. The groove size is shown in figure 1 As shown, the bevel angle is 60° and the blunt edge is 2mm.

[0020] Welding material matching:

[0021] Matching welding material: The chemical composition and weight percentage of the welding wire are: C: 0.04, Si: 0.07, Mn: 1.60, Ni: 0.60, Ti: 0.11, B: 0.004, P ≤ 0.015, S ≤ 0.010, the rest is iron And inevitable impurities. The diameter of the welding wire is Φ1.2mm.

[0022] Gas shielded butt welding of steel plates with a combination of 50mm+50mm thickness: its welding process...

Embodiment 2

[0025] Base material: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 50mm+50mm; the mechanical properties of the steel plate with a thickness of 50mm are: yield strength R eL : 530MPa, tensile strength R m :595MPa, elongation rate A: 21%, impact energy A at -40°C KV :205J. The size of the test plate is 600mm×400mm×50mm, and the gas shielded welding groove adopts a double-sided V-shaped symmetric groove. The groove size is shown in figure 1 As shown, the bevel angle is 60° and the blunt edge is 2mm.

[0026] Welding material matching:

[0027] Matching welding materials: The chemical composition and weight percentage of the welding wire are: C: 0.010, Si: 0.10, Mn: 1.80, Ni: 0.80, Ti: 0.17, B: 0.005, P ≤ 0.015, S ≤ 0.010, the rest is iron And inevitable impurities. The diameter of the welding wire is Φ1.2mm.

[0028] Gas shielded butt welding of steel plates with a combination of 50mm+50mm thickness: its welding proce...

Embodiment 3

[0032] Base material: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 50mm+50mm; the mechanical properties of the steel plate with a thickness of 50mm are: yield strength R eL : 540MPa, tensile strength R m : 635MPa, elongation rate A: 21%, impact energy A at -40°C KV :188J. The size of the test plate is 600mm×400mm×50mm, and the gas shielded welding groove adopts a double-sided V-shaped symmetric groove. The groove size is shown in figure 1 As shown, the bevel angle is 60° and the blunt edge is 2mm.

[0033] Welding material matching:

[0034] Matching welding materials: The chemical composition and weight percentage of the welding wire are: C: 0.08, Si: 0.07, Mn: 1.70, Ni: 0.70, Ti: 0.14, B: 0.007, P ≤ 0.015, S ≤ 0.010, the rest is iron And inevitable impurities. The diameter of the welding wire is Φ1.2mm.

[0035] Gas shielded butt welding of steel plates with a combination of 50mm+50mm thickness: its welding process...

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Abstract

The invention discloses a gas-shielded welding method for high-strength bridge steel, which comprises the following steps: (1) the high-strength bridge steel with the tensile strength of between 570 and 650MPa and the thickness of 50 millimeters is adopted, a matched welding material is adopted, wherein the tensile strength of a welding wire is between 570 and 660MPa, and the diameter of the welding wire is 1.2 millimeters; (2) a gas-shielded welding groove adopts a double V-shaped symmetrical groove, the angle of the groove is 60 DEG, and the truncated edge is 2 millimeters; (3) the welding process specification is as follows: the welding current is between 250 and 270 amperes, the welding voltage is between 23 and 27 volts, the welding speed is between 30 and 29 centmeters / minute, the welding heat input is between 12 and 15kJ / cm, the argon-rich mixed gas metal arc welding with 20 percent of CO2 and 80 percent of Ar is adopted, the flow of gas is between 18 and 20 liters / minute, no preheating is performed before welding, and no heat treatment is performed after the welding; and (4) the gas-shielded welding adopts multi-layer multi-passage continuous welding, and the interlayer temperature is controlled to between 100 and 150 DEG C. The welding method has the advantages of good welding processing property, simple and convenient operation, applicability, convenience, high efficiency, and energy conservation, and is applicable to the manufacturing, promotion and application of large-span bridge steel of factories.

Description

Technical field [0001] The invention belongs to a welding method of bridge steel in bridge construction, and specifically relates to a welding method suitable for welding tensile strength R m Gas shielded welding of ≥570MPa grade low-alloy high-strength bridge engineering structural steel. Background technique [0002] As the overall design of the bridge gradually develops towards high strength, large span, heavy load and high speed. In order to meet the requirements of the development of bridge construction in our country, WISCO (Group) Company has developed 14MnNbq, WNQ570, Q345D, Q345E, Q345C-Hq and other high-strength and high-toughness bridge series steels in recent years. The level of steel grades, especially the low-temperature impact toughness has been greatly improved. The improvement of the performance of the base material puts forward urgent requirements for the matching welding materials and welding processes. As bridge welded structures are increasingly developing to...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/095B23K33/00
Inventor 缪凯刘吉斌黄治军王玉涛牟文广胡因洪胡家国陈浮周运武方要治
Owner WUHAN IRON & STEEL (GROUP) CORP
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