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Welding method of Q500qE and Q690qE ultra-low carbon bainitic steel heterologous butt joints

A carbon bainitic steel and butt joint technology, which is applied in the field of steel bridge manufacturing, can solve problems such as difficulty, and achieve the effects of improving strength, low-temperature impact toughness, and increasing low-temperature impact toughness.

Active Publication Date: 2019-05-17
CHINA RAILWAY BAOJI BRIDGE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is the selection of welding materials or the formulation of welding processes, it is extremely difficult

Method used

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  • Welding method of Q500qE and Q690qE ultra-low carbon bainitic steel heterologous butt joints
  • Welding method of Q500qE and Q690qE ultra-low carbon bainitic steel heterologous butt joints
  • Welding method of Q500qE and Q690qE ultra-low carbon bainitic steel heterologous butt joints

Examples

Experimental program
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Effect test

example 1

[0053] Base material test plate test plate: 32mmx200mmx800mm, the material is Q690qE, 44mmx 200mmx800mm material is Q500qE, different strength materials are not equal in thickness and flat; when welding, follow the steps below:

[0054] (1) Thickness reduction processing is carried out at the joint of the thick steel plates of the two unequal thickness steel plates of Q500qE and Q690qE respectively. The slope ratio of the sides is 1:8;

[0055] (2) Process a V-shaped groove at the joint of two steel plates, the groove angle is 20°-22°, the assembly gap is 6-8mm, and a ceramic liner 1 is placed on one side of the assembly gap; figure 1 shown.

[0056] (3) Before welding, use electromagnetic induction heating equipment to preheat the steel plate. The preheating temperature of the steel plate is 75-85°C, and then use mixed gas shielded welding to weld the inner bottom of the groove. Then use solid welding wire to fill and weld layer by layer and fill the groove; clean the layer...

example 2

[0076] The base material test plate is used: 32mmx200mmx800mm, the material is Q690qE, and the material is 44mmx 200mmx800mm, the material is Q500qE, and the materials of different strengths are not equal in thickness.

[0077] (1) Thickness reduction processing is carried out at the joint of the thick steel plates of the two unequal thickness steel plates of Q500qE and Q690qE respectively. The slope ratio of the sides is 1:10;

[0078] (2) Process a V-shaped groove at the joint of two steel plates, the groove angle is 20°-22°, the assembly gap is 6mm, and a ceramic liner 1 is placed on one side of the assembly gap; figure 1 shown;

[0079] (3) Before welding, use electromagnetic induction heating equipment to preheat the steel plate. The preheating temperature of the steel plate is 75-85°C, and then use mixed gas shielded welding to weld the inner bottom of the groove. The solid welding wire is filled and welded layer by layer and the groove is filled; the interlayer cleani...

Embodiment 3

[0099] (1) Thickness reduction processing is carried out at the joint of the thick steel plates of the two unequal thickness steel plates of Q500qE and Q690qE respectively. The slope ratio of the sides is 1:9;

[0100] (2) Process a V-shaped groove at the joint of the two steel plates, the groove angle is 20°-22°, the assembly gap is 8mm, and a ceramic liner is placed on one side of the assembly gap;

[0101] (3) Before welding, use electromagnetic induction heating equipment to preheat the steel plate. The preheating temperature of the steel plate is 75-85°C, and then use mixed gas shielded welding to weld the inner bottom of the groove. The solid welding wire is filled and welded layer by layer and the groove is filled; the interlayer cleaning is carried out during the welding process, and the interlayer temperature of the weld bead is 140-160°C; when welding, vertical welding is adopted, and the welding current for backing, filling and covering is 130 —140A, welding voltag...

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Abstract

The invention discloses a welding method of Q500qE and Q690qE ultra-low carbon bainitic steel heterologous butt joints and belongs to the field of steel bridge manufacture. The welding method comprises the following steps: carrying out thickness reducing processing on a butt joint part of a thicker steel plate in two steel plates different in thickness, processing a transitional bevel edge on thethicker steel plate to enable the thicknesses of the two steel plate to be consistent, wherein the ratio of slope of the transitional bevel edge is 1:(8-10); processing a V-shaped groove in the butt joint part of the two steel plates, wherein the groove angle is 20-22 degrees, and the assembling clearance is 6-8 mm; placing a ceramic liner on one side of the assembling clearance; after preheatingthe steel plates, adopting mixed gas arc welding to weld one to two bottoming welding seams with solid wires at the inner bottom of the groove, and then, adopting solid wires to carry out layer-by-layer filling welding and fill the groove; during the welding process, carrying out interlayer cleaning, wherein the weld bead interlayer temperature is 140-160 DEG C; and after welding, adopting thermalinsulating measures. With adoption of the welding method, high-strength welding of Q500qE and Q690qE with different strengths is realized, and the welding method can be used for welding constructionof bridge structural components.

Description

technical field [0001] The invention relates to a method for welding heterogeneous butt joints of ultra-low carbon bainite steel, which belongs to the field of steel bridge manufacturing and is suitable for welding the heterogeneous butt joints of Q500qE and Q690qE steels in the horizontal and vertical positions. Background technique [0002] Welded steel bridges have been widely used in bridge construction due to their unique advantages such as light weight, long service life, energy saving and environmental protection, and show a trend of developing towards long-span and high-strength grades. The highest strength grade of my country's bridge steel for engineering application is only Q500qE (tensile strength ≥ 630Mpa), which was first developed by WISCO and first applied to the Shanghai-Tongjiang River Bridge. and [0003] The U.S. and Japan bridge slabs use a maximum yield strength of 690MPa, and weathering steel is widely used. Bridge steel restricts the development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/00B23K35/24C22C38/58C22C38/44C22C38/42C22C38/02C22C38/00B23K103/04
Inventor 李军平朱新华车平刘志刚吴江波杜伟李彦国张海涛孙蕾蕾杨洪涛
Owner CHINA RAILWAY BAOJI BRIDGE GRP
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