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Welding method of high-strength steel of 900 MPa level

A welding method and high-strength steel technology, applied in welding media, welding equipment, welding equipment and other directions, can solve problems such as restricting production efficiency, and achieve the effect of simplifying welding equipment, reducing costs, and improving mechanical performance

Inactive Publication Date: 2015-11-04
SHANDONG ENERGY HEAVY EQUIP MFG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the non-preheating welding process of 800MPa, 900MPa and 900MPa grade high-strength steels is respectively proposed, which can realize the non-preheating welding of some high-strength steels. Although satisfactory welded joints can be obtained, the bottoming, filling and covering When welding, different types and grades of electrodes or wires are used, which seriously restricts production efficiency and is difficult to popularize and apply in robot automatic welding

Method used

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  • Welding method of high-strength steel of 900 MPa level

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] The steel plate to be welded is: Q890 high-strength steel, the size is 350mm×150mm×25mm, and the welding wire is: GHS-90.

[0032] A welding method for 900MPa grade high-strength steel, comprising the following steps:

[0033] (1) Shot blasting is performed on the surface of the high-strength steel until the metallic luster is exposed, and then a K-shaped bevel is made with a bevel angle of 30° and a blunt edge of 3mm. After beveling, the oxide layer on the bevel surface is manually removed;

[0034] (2) Preheat the high-strength steel to be welded, the preheating temperature is 150°C, and then spot welding is formed, the spot welding length is 80mm, and the spacing is 200mm;

[0035] (3) Preheating the formed high-strength steel obtained in step (2) as a whole, and the temperature is 180° C.;

[0036] (4) 90kg grade welding wire and gas shielded welding are used for bottom welding, and the shielding gas is Ar+CO 2 Mixed gas, the volume ratio is Ar:CO 2 =70%: 30%, us...

Embodiment 2

[0044] The steel plate to be welded is: Q890 high-strength steel, the size is 350mm×150mm×30mm, and the welding wire is: GHS-90.

[0045] A welding method for 900MPa grade high-strength steel, comprising the following steps:

[0046] (1) Shot blasting is performed on the surface of the high-strength steel until the metallic luster is exposed, and then a K-shaped bevel is made with a bevel angle of 30° and a blunt edge of 2mm. After beveling, the oxide layer on the bevel surface is manually removed;

[0047] (2) Preheat the high-strength steel to be welded, the preheating temperature is 160°C, and then spot welding is formed, the spot welding length is 100mm, and the spacing is 200mm;

[0048] (3) Preheating the formed high-strength steel obtained in step (2) as a whole, and the temperature is 160° C.;

[0049](4) 90kg grade welding wire and gas shielded welding are used for bottom welding, and the shielding gas is Ar+CO 2 Mixed gas, the volume ratio is Ar:CO 2 = 80%: 20%, u...

Embodiment 3

[0057] The steel plate to be welded is: Q890 high-strength steel, the size is 350mm×150mm×35mm, and the welding wire is: GHS-90.

[0058] A welding method for 900MPa grade high-strength steel, comprising the following steps:

[0059] (1) Shot blasting is performed on the surface of the high-strength steel until the metallic luster is exposed, and then a K-shaped bevel is made with a bevel angle of 30° and a blunt edge of 3mm. After beveling, the oxide layer on the bevel surface is manually removed;

[0060] (2) Preheat the high-strength steel to be welded, the preheating temperature is 120°C, and then spot welding is formed, the spot welding length is 120mm, and the spacing is 200mm;

[0061] (3) Carry out overall preheating to the formed high-strength steel obtained in step (2), and the temperature is 200° C.;

[0062] (4) 90kg grade welding wire and gas shielded welding are used for bottom welding, and the shielding gas is Ar+CO 2 Mixed gas, the volume ratio is Ar:CO 2 =8...

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Abstract

The invention discloses a welding method of high-strength steel of the 900 MPa level and belongs to the technical field of high-strength steel welding. The method sequentially comprises the steps of clearing, chamfering, spot welding, overall preheating, bottoming welding, filling welding, cover face welding and heat treatment. All welding wires are welding wires of the 90 kg level. By means of the method, large scale automatic welding in a factory is facilitated, procedures are saved, and the method can be popularized to the welding field of automated robots.

Description

technical field [0001] The invention relates to the technical field of high-strength steel welding, in particular to a welding method for 900MPa high-strength steel. Background technique [0002] With the construction of large-scale coal mines in the country, hydraulic supports with large resistance and high reliability are continuously designed and manufactured, but the increase in weight will inevitably affect their transportation and underground handling. Therefore, high-strength steels (such as Q550, Q690, Q800, Q890 and above) to manufacture the hydraulic support to achieve lightweight design and manufacture, and at the same time meet the reliability requirements of the hydraulic support. At present, it is of great practical significance to save raw materials and realize lean production. [0003] In the prior art, the non-preheating welding process of 800MPa, 900MPa and 900MPa grade high-strength steels is respectively proposed, which can realize the non-preheating wel...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K35/00B23K103/04
CPCB23K9/173B23K35/00B23K2103/04
Inventor 曹成铭卜美兰李圣文高强梁峰李广新任燕陈波
Owner SHANDONG ENERGY HEAVY EQUIP MFG GRP CO LTD
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