阅读说明：本技术 一种高强钢伸缩臂的等离子气体保护焊焊接工艺 (Plasma gas shielded welding process for high-strength steel telescopic arm ) 是由 王健 王毅民 朱英卓 许卓文 沈骥江 田华宁 丁传江 郭峰 杨林 于 2018-06-25 设计创作，主要内容包括：本发明公开了一种高强钢伸缩臂的等离子气体保护焊焊接工艺,包括以下步骤：焊前清理：首先把伸缩臂待焊接截面处的氧化皮清理干净；焊接：采用的等离子气体为流量4.2～6.5L/min、容积纯度99.999％的氩气,采用的保护气体流量为15～20L/min,所述保护气体中容积纯度为99.99％的氩气占体积比为95％、氢气占体积比为5％；焊枪至所述伸缩臂待焊接截面的距离为4～6mm；采用I型焊缝,所述焊缝为全熔透型,所述焊缝内不填焊丝,再按照以下焊接工艺参数进行焊接：焊接坡口为I型,钢板厚度为4～10mm,焊接速度为200～330mm/min,焊接电流为175～240A。该工艺焊缝均匀且不易变形。(The invention discloses a plasma gas shielded welding process of a high-strength steel telescopic arm, which comprises the following steps of: cleaning before welding: firstly, cleaning oxide skin at the to-be-welded section of the telescopic boom; welding: the plasma gas is argon with the flow rate of 4.2-6.5L/min and the volume purity of 99.999%, the flow rate of the adopted protective gas is 15-20L/min, the argon with the volume purity of 99.99% in the protective gas accounts for 95% by volume, and the hydrogen accounts for 5% by volume; the distance from the welding gun to the to-be-welded section of the telescopic arm is 4-6 mm; adopting an I-shaped welding seam which is of a full penetration type, filling no welding wire in the welding seam, and then welding according to the following welding process parameters: the welding groove is I-shaped, the thickness of the steel plate is 4-10 mm, the welding speed is 200-330 mm/min, and the welding current is 175-240A. The process has uniform welding line and is not easy to deform.)

1. A plasma gas shielded welding process of a high-strength steel telescopic arm is characterized by comprising the following steps of:

a) cleaning before welding: firstly, cleaning oxide skin at the to-be-welded section of the telescopic boom;

b) welding: the plasma gas is argon with the flow rate of 4.2-6.5L/min and the volume purity of 99.999%, the flow rate of the adopted protective gas is 15-20L/min, the argon with the volume purity of 99.99% in the protective gas accounts for 95% by volume, and the hydrogen accounts for 5% by volume; the distance from the welding gun to the to-be-welded section of the telescopic arm is 4-6 mm; adopting an I-shaped welding seam which is of a full penetration type, filling no welding wire in the welding seam, and then welding according to the following welding process parameters: the welding groove is I-shaped, the thickness of the steel plate is 4-10 mm, the welding speed is 200-330 mm/min, and the welding current is 175-240A.

2. The plasma gas shielded welding process of the high-strength steel telescopic arm according to claim 1, characterized in that: the telescopic arm is made of carbon steel or stainless steel with yield strength not lower than 460 MPa.

Technical Field

The invention relates to a gas shielded welding process of high-strength steel, in particular to a plasma gas shielded welding process of a high-strength steel telescopic arm.

Background

The telescopic boom structure is mainly applied to hoisting equipment, is a common structure of modern various hoisting and overhead working equipment and the like, and is usually mobile equipment, so that the boom not only needs to ensure the precision during manufacturing, but also needs to meet the requirement of light weight.

Disclosure of Invention

The invention aims to provide a plasma gas shielded welding process of a high-strength steel telescopic arm, and aims to solve the technical problems that in the prior art, the telescopic arm welding process has large welding deformation and is difficult to realize single-side welding and double-side forming of a full penetration weld.

In order to achieve the purpose, the invention provides a plasma gas shielded welding process of a high-strength steel telescopic arm, which comprises the following steps of:

a) cleaning before welding: firstly, cleaning oxide skin at the to-be-welded section of the telescopic boom;

b) welding: the plasma gas is argon with the flow rate of 4.2-6.5L/min and the volume purity of 99.999%, the flow rate of the adopted protective gas is 15-20L/min, the argon with the volume purity of 99.99% in the protective gas accounts for 95% by volume, and the hydrogen accounts for 5% by volume; the distance from the welding gun to the to-be-welded section of the telescopic arm is 4-6 mm; adopting an I-shaped welding seam which is of a full penetration type, filling no welding wire in the welding seam, and then welding according to the following welding process parameters: the welding groove is I-shaped, the thickness of the steel plate is 4-10 mm, the welding speed is 200-330 mm/min, and the welding current is 175-240A.

Furthermore, the telescopic arm is made of carbon steel or stainless steel with yield strength not lower than 460 MPa.

The method has the following beneficial effects: the plasma gas shielded welding process for the high-strength steel telescopic arm has the advantages of high welding speed, stable welding process and uniform welding seams, and the welding seams are full penetration type, so that the welding process is high in strength and not easy to deform.

Detailed Description