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High-strength steel high-ductility gas shielded welding wire

A gas shielded welding wire, high toughness technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of high alloy content, low efficiency, need for heat treatment, etc., to achieve stable process performance and stable welding arc , the effect of stable quality

Inactive Publication Date: 2009-05-27
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Invention patent application No. 95103056.6 introduces "a high-strength and high-toughness welding wire". The tensile strength of the deposited metal of this welding wire is 750-850Mpa, and it has good low-temperature impact toughness. It is difficult to pull out, low in efficiency, and requires heat treatment after welding, which is not conducive to large-scale industrial production and popularization and application
[0004] Invention patent application number 01133651.X introduced "high toughness gas shielded welding wire for low alloy high strength steel" by adding appropriate amount of Ni, Cr, Ti, B and other elements to make the tensile strength of weld metal 700 ~ 800MPa, suitable for 700MPa level Gas-shielded arc welding of low-alloy high-strength steel is not suitable for gas-shielded arc welding of 800MPa low-alloy high-strength steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Desulfurization of molten iron → converter smelting → LF furnace refining → 160mm 2 Full protection pouring of billet casting machine. Low-sulfur molten iron is used for steelmaking. When the sulfur content of the molten iron is high, desulfurization and slag removal of the molten iron is carried out. The steelmaking process is carried out according to the technical operation rules and relevant operating points. Bottom double blowing effect, strict control of steelmaking end point composition, tapping temperature, slag amount and other parameters. Will be 160mm 2 The billet is hot-rolled into a Φ5.5mm wire rod. After removing the surface scale, wire drawing, and copper plating, it is made into a Φ1.6mm welding wire. The chemical composition of the welding wire (by weight%): C0.05, Mn1.40, Si0. 50, Cr0.5, Ni1.55, Mo 0.4, Ti0.09, Cu0.30, S0.003, P0.014, the balance is iron and unavoidable impurities.

[0023] The welding wire of the present invention is in C...

Embodiment 2

[0024] Embodiment 2: manufacturing method is identical with embodiment 1, makes Φ 1.6mm welding wire, the chemical composition (by weight %) of welding wire: C0.09, Mn1.70, Si0.60, Cr0.45, Ni1.6, Mo 0.75, Ti0.13, Cu0.40, S0.006, P0.018, the balance is iron and unavoidable impurities.

[0025] The welding wire of the present invention adopts CO 2 Deposited metal welding is carried out under protection. The specifications are: welding current 300-330A, welding voltage 28-30V, welding speed 5.0mm / s, and control interlayer temperature ≤ 150°C. The thickness of the welding plate is 20mm, the groove angle is 45°, with a 14mm backing plate, and the root gap is 12mm. Mechanical properties of deposited metal: σ s =690Mpa, σ b =820Mpa, δ 5 =20%, -20℃ impact energy A kV =95J.

Embodiment 3

[0026] Embodiment 3: manufacturing method is identical with embodiment 1, makes Φ 1.6mm welding wire, the chemical composition (by weight %) of welding wire: C0.12, Mn1.90, Si0.70, Cr0.7, Ni1.8, Mo 0.80, Ti0.18, Cu0.60, S0.002, P0.014, the balance is iron and unavoidable impurities.

[0027] The welding wire of the present invention adopts mixed gas, 80% Ar+20% CO 2 Deposited metal welding is carried out under protection. The specifications are: welding current 300-330A, welding voltage 28-30V, welding speed 5.5mm / s, and control interlayer temperature ≤ 150°C. The thickness of the welding plate is 20mm, the groove angle is 45°, with a 14mm backing plate, and the root gap is 12mm. Mechanical properties of deposited metal: σ s =700Mpa, σ b =850Mpa, δ 5 =19%, -20℃ impact energy A kV =95J.

[0028] During the welding process, the welding test plate does not need to be preheated, the welding arc is stable, no porosity, good slag removal performance, low spatter, beautiful wel...

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Abstract

The invention relates to a high-tenacity gas-shielded welding wire for high-tensile steel. The welding wire solves problems of 780-850MPa-level low-alloy high-tensile steel welding material, including lack of matching performance and especially poor toughness and high cost. The technical proposal of the invention comprises that the chemical component consists of (counted by weight percentage) 0.05-0.13 percent of C, 1.4-1.9 percent of Mn, 0.4-0.8 percent of Si, 0.4-0.8 percent of Cr, 1.5-1.8 percent of Ni, 0.3-0.8 percent of Mo, 0.06-0.25 percent of Ti, 0-0.60 percent of Cu, not more than 0.025 percent of S, not more than 0.025 percent of P and the balance of Fe and unavoidable impurity elements. When gas-shielded welding is carried out on the welding wire, the welding line has the metal tensile strength of 780-850MPa; the ballistic work AkV at -20 DEG C is not less than 70J, thereby applying to gas-shielded arc welding of 780-850MPa-level low-alloy high-tensile steel.

Description

technical field [0001] The invention relates to a gas shielded welding wire for welding metal materials, which is suitable for welding high-strength and high-toughness steel types. The welding wire uses CO 2 Or mixed gas 80%Ar+20%CO 2 During shielded welding, the tensile strength of the weld metal is 780-850MPa, and the impact energy at -20°C is A kV ≥70J, suitable for gas-shielded arc welding of 780-850MPa low-alloy high-strength steel, with good process performance. Background technique [0002] The steel grades used for components such as high-rise buildings, oil pipelines, pressure vessels, coal mine machinery, cross-sea bridges, military industry warships, etc. have the characteristics of high strength and high toughness, and the strength level reaches 780-850MPa. Therefore, higher requirements are put forward for the performance of the welded joint. The welded joint must have a strength equivalent to that of the base metal to reach 780-850 MPa, and at the same time ...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 张飞虎董现春陈延清邱利张永强郭占山鞠建斌陈涛
Owner SHOUGANG CORPORATION
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