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50 kilogram-grade flux-cored wire for relieving stress after welding

A technology of stress relief and flux-cored welding wire, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of reducing the yield strength and tensile strength of the weld, the decline of low-temperature impact performance, and the reduction of thermal cracking resistance and other problems, to achieve the effect of improving thermal cracking resistance, excellent cracking resistance, and improving cracking resistance

Inactive Publication Date: 2017-02-22
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional 50kg flux cored wire can release the residual stress in the weld and improve the fatigue strength and fracture ductility of the weld after stress relief annealing, but it will reduce the yield strength and tensile strength of the weld
In addition, the heating process of stress relief will not only promote the precipitation of Nb, V and other elements in the weld and C, which will greatly reduce the low-temperature impact performance, but also promote the diffusion of P, S and other impurity elements into the weld metal grains. In the boundary, thus causing the temper embrittlement of the weld and reducing the thermal cracking resistance

Method used

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  • 50 kilogram-grade flux-cored wire for relieving stress after welding
  • 50 kilogram-grade flux-cored wire for relieving stress after welding
  • 50 kilogram-grade flux-cored wire for relieving stress after welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Adopt the general manufacturing process in the welding wire production industry, make the steel strip (i.e. the outer skin) according to the steel strip components in Table 1-1, prepare according to the welding flux formula in Table 1-2, and wrap the flux in the steel strip (overlap ):

[0111] Table 1-1: Steel strip composition (%)

[0112] C Si mn Al P S Fe 0.022 0.015 0.14 0.022 0.006 0.005 margin

[0113] Table 1-2: Soldering Flux Formulation (%)

[0114] TiO 2

SiO 2

ZrO 2

Fluoride Na 2 o

K 2 o

Al+Mg 37.8 3.6 2.5 1.5 0.74 3.2 2.8 C mn Si Ni Ti B Fe 0.10 16.3 1.6 2.5 1.5 0.06 25.80

[0115] The chemical composition of the deposited metal is shown in Table 1-3, and the mechanical properties of the deposited metal and the diffusible hydrogen content of the deposited metal (mercury method) in the welded state and the stress-relieved annealed state (620°C×4h)...

Embodiment 2

[0121] Adopt the same welding wire manufacturing method as in Example 1, and prepare according to the steel strip components in Table 2-1 and the flux formulation in Table 2-2:

[0122] Table 2-1: Steel strip composition (%)

[0123] C Si mn Al P S Fe 0.027 0.018 0.15 0.030 0.008 0.007 margin

[0124] Table 2-2: Soldering Flux Formulation (%)

[0125]

[0126]

[0127] The chemical composition of the deposited metal is shown in 2-3. The mechanical properties of the deposited metal and the diffusible hydrogen content of the deposited metal (mercury method) in the welded state and the stress-relieved annealed state (620°C×4h) are shown in Table 2-4:

[0128] Table 2-3: Chemical composition of deposited metal (%)

[0129] C mn Si P S Al Ni Ti B 0.038 1.18 0.25 0.007 0.007 0.009 0.45 0.052 0.0027

[0130] Table 2-4: Mechanical properties and diffusible hydrogen of deposited metal

[0131]

Embodiment 3

[0133] Adopt the same welding wire manufacturing method as in Example 1, and prepare according to the steel strip components in Table 3-1 and the flux formulation in Table 3-2:

[0134] Table 3-1: Steel strip composition (%)

[0135]

[0136]

[0137] Table 3-2: Soldering Flux Formulation (%)

[0138] TiO 2

SiO 2

ZrO 2

Fluoride Na 2 o

K 2 o

Al+Mg 42.3 5.4 2.1 1.7 0.56 2.7 3.8 C mn Si Ni Ti B Fe 0.11 15.4 2.4 2.9 1.8 0.06 18.77

[0139] The chemical composition of the deposited metal is shown in 3-3. The mechanical properties of the deposited metal and the diffusible hydrogen content of the deposited metal (mercury method) in the welded state and the stress-relieved annealed state (620°C×4h) are shown in Table 3-4:

[0140] Table 3-3: Chemical composition of deposited metal (%)

[0141] C mn Si P S Al Ni Ti B 0.041 1.23 0.28 0.007 0.006 0.011 0.47 0.054 0.0025...

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Abstract

The invention discloses a 50 kilogram-grade flux-cored wire for relieving stress after welding. The flux-cored wire has excellent crack resistance, weld metal has excellent mechanical property on the as-welded condition and the stress relieving and annealing conditions (620 DEG C * 4 h), the impact value is high (AW is greater than or equal to 100 J and SR is greater than or equal to 80 J) especially at -40 DEG C, and the welding requirement of EH36 can be met.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a 50-kg flux-cored welding wire suitable for stress relief after welding. Background technique [0002] In recent years, due to the harsh low temperature environment of the ocean and the impact of waves, the shipbuilding industry has faced great challenges. Some important parts of the hull design, such as corners where stress is concentrated, use EH36 and supporting welding materials to improve the hull's resistance to brittle fracture during rough sea navigation. These parts are often stressed after welding, and some local annealing is required to release the stress in order to improve the fracture ductility and low temperature impact performance of the weld. However, the traditional 50 kg flux-cored wire can release the residual stress in the weld and improve the fatigue strength and fracture ductility of the weld after stress relief annealing, but it will reduce the yield str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/368
CPCB23K35/3073B23K35/368
Inventor 蔡鸿祥庄石城叶桂林周峙宏
Owner KUSN GINTUNE WELDING
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