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Method for welding 22SiMn2TiB steel scraper bucket edge

A welding method and bucket technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high labor intensity, difficult preheating and heat preservation, etc., to save energy, reduce labor intensity of workers, and improve efficiency Effect

Inactive Publication Date: 2010-08-11
厦门厦工协华机械有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Workers are welding on the preheated workpiece, which is steaming, sweating, and labor-intensive
Especially for large welded structures such as bucket blades with a size of up to 3 meters, it is difficult to implement preheating and heat preservation in actual production

Method used

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  • Method for welding 22SiMn2TiB steel scraper bucket edge
  • Method for welding 22SiMn2TiB steel scraper bucket edge
  • Method for welding 22SiMn2TiB steel scraper bucket edge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first embodiment of the welding method of the 22SiMn2TiB steel bucket edge of the present invention is to adopt CO2 gas shielded welding to butt weld the 22SiMn2TiB steel bucket edge with a thickness of 30 millimeters and the 16Mn steel bucket with a base material thickness of 12 millimeters.

[0028] Please refer to Figure 1; before welding, make a V-shaped groove on the joint of the thicker 22SiMn2TiB steel plate (bucket edge), the V-shaped groove angle is 50°-55°, and leave a 2mm blunt edge. The assembly gap between 22SiMn2TiB steel bucket blade and 16Mn steel bucket is controlled between 1mm-3mm. The groove angle should not be too large; the weld should be narrow rather than wide. Oil, rust, water, etc. must be removed from the groove surface and its vicinity before welding.

[0029] According to the principle of low matching, a solid welding wire of the type H08Mn2SiA with a diameter of 1.2mm and a deposited metal strength of 500Mpa is selected. For the techn...

Embodiment 2

[0034] The second embodiment of the welding method of the 22SiMn2TiB steel bucket edge of the present invention is to adopt CO2 gas shielded welding to butt weld the 22SiMn2TiB steel bucket edge with a thickness of 30 millimeters and the 16Mn steel bucket with a base material thickness of 12 millimeters.

[0035]Before welding, please refer to Figure 1; make a V-shaped groove on the thicker 22SiMn2TiB steel bucket edge joint, the V-shaped groove angle is 50°-55°, and leave a 2mm blunt edge. The assembly gap between 22SiMn2TiB steel bucket blade and 16Mn steel bucket is controlled between 1mm-3mm. The groove angle should not be too large; the weld should be narrow rather than wide. Oil, rust, water, etc. must be removed from the groove surface and its vicinity before welding.

[0036] According to the principle of low matching, the flux-cored welding wire with a diameter of 2.0mm and a strength of deposited metal of 500Mpa is selected as EF0035041. Please refer to GB10045-85 ...

Embodiment 3

[0041] The third embodiment of the welding method of the 22SiMn2TiB steel bucket edge of the present invention is to use Ar+CO2 mixed gas shielded welding to connect the 22SiMn2TiB steel bucket edge with a thickness of 30 mm and the 16Mn steel bucket with a base material thickness of 12 mm. weld.

[0042] Please refer to Figure 2; before welding, make a V-shaped groove on the joint of the thicker 22SiMn2TiB steel plate (bucket edge), the V-shaped groove angle is 50°-55°, and leave a 2mm blunt edge. The assembly gap between 22SiMn2TiB steel bucket blade and 16Mn steel bucket is controlled between 1mm-3mm. The groove angle should not be too large; the weld should be narrow rather than wide. Oil, rust, water, etc. must be removed from the groove surface and its vicinity before welding.

[0043] According to the principle of low matching, a solid welding wire of the type H08Mn2SiA with a diameter of 1.2mm and a deposited metal strength of 500Mpa is selected. For the technical p...

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Abstract

The invention discloses a method for welding 22SiMn2TiB steel bucket edges, and relates to a method for welding a high-strength steel large workpiece. The method of the invention and a method for welding a bucket with the base material being 16Mn steel comprise the following processing steps: forming a V-shaped groove on a thick plate connector, wherein the angle of the V-shaped groove is 50 DEG to 55 DEG, and a 2 mm blunted edge is left; controlling the assembly clearance within the range of 1 mm to 3 mm; welding under the protection of the CO2 gas, wherein the flow rate of the CO2 gas is 16to 20 L / min, and the interlayer temperature is 100 DEG C to 150 DEG C; continuously and ceaselessly welding the solid welding wires with the diameter being 1.2 mm or the cored welding wires with the diameter being 2.0 mm with small multi-welding bead and less weaving based on the low matching principle, wherein the deposited metal strength is 500 MPa, the energy of the backing welding and edge welding wire is controlled within the range of 8 to 12 kJ / cm, and the energy of each layer of the subsequent welding wire is controlled within the range of 12 to 20 kJ / cm; and checking for the quality of the welding connector, and grinding out the reinforcement of the welding line at the stress concentration part, so that the part is parallel and level with the base materials. The method solves the problem that the pre-heating and the heat-insulating are required before and after welding.

Description

technical field [0001] The invention relates to a welding method for a large workpiece of high-strength steel. Background technique [0002] 22SiMn2TiB steel is a kind of armor steel, the price is more than 20% lower than that of various high-strength wear-resistant steels of the same strength. After quenching and tempering, the steel has σb≥1400Mpa and HRC≥40, which is one of the highest strength weldable high-strength steels and meets the requirements of the IE0921 standard for loader bucket blade steel of the US CAT company. If the performance of the 22SiMn2TiB steel welded joint area is guaranteed, the 22SiMn2TiB steel can be used to produce high-strength wear-resistant bucket edges, thereby reducing production costs. As we all know, with the increase of the strength of steel, hardening cracking is more and more prone to occur in the welding process. Especially in the welding process of high-strength steel, the problem of hardening cracking becomes the key to determine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235
Inventor 江全昌李劲锋
Owner 厦门厦工协华机械有限公司