CN-121339759-B - Hydrogen embrittlement resistant welding wire for welding ultrahigh-strength aluminum-silicon coating hot forming steel and welding method

Abstract

The invention discloses an anti-hydrogen embrittlement welding wire for welding ultra-high strength aluminum silicon coating hot forming steel and a welding method, belonging to the technical field of metal materials, and comprising the following components of less than or equal to 0.1% of C, 5.0% -7.0% of Ni, 0.3% -0.6% of Mo, 0.08% -0.12% of Nb, 0.05% -0.1% of V, 0.1% -0.5% of La, 0.1% -0.5% of Ce, and the balance of iron and unavoidable impurities.

Inventors

• Jiang Zhigong
• GAO YI
• FAN ZHE
• YANG BAOFENG
• LIU JIEWEI
• LI TIAN
• Jia Shengguang
• Mao Yunquan
• Dang Libiao
• WANG XIAONAN

Assignees

• 鞍钢钢材加工配送（长春）有限公司

Dates

Publication Date

20260505

Application Date

20251216

Claims (1)

1. 1. The hydrogen embrittlement resistant welding wire for the ultra-high strength aluminum-silicon coating hot forming steel splice welding is characterized by comprising the following components in percentage by mass: C:≤0.1%; Ni:5.0%~7.0%; Mo:0.3%~0.6%; 0.08% -0.12% of Nb, and Mo, nb and C react to form Mo 2 C/NbC nano-phase fixed free hydrogen; v is 0.05% -0.1%, and VC nano-phase fixed free hydrogen is formed through reaction; La:0.5%~0.8% ; Ce:0.3%~0.5%; Ti:0.1%~0.5%; The balance being iron and unavoidable impurities.

Description

Hydrogen embrittlement resistant welding wire for welding ultrahigh-strength aluminum-silicon coating hot forming steel and welding method Technical Field The invention belongs to the technical field of metal materials, and particularly relates to a hydrogen embrittlement resistant welding wire for welding ultra-high strength aluminum-silicon coating hot forming steel and a welding method. Background Thermoforming parts have been widely used in automotive bodies. In order to avoid surface decarburization and oxidation of the steel plate in the hot stamping forming process, an aluminum-based or silicon-based coating is often coated on the surface of the steel plate, but in the welding process, the coating is melted into a welding line to cause that a high Al-Si coating (more than or equal to 150g/m < 2 >) is melted into the welding line to aggravate delta ferrite generation, carbon in a welding line area is diluted to cause that the strength is lower than that of a base metal, meanwhile, the hydrogen-induced delayed cracking risk of the welding line of the high-strength steel is obvious, and the traditional process is difficult to control. Solves the problem of welding the aluminum-silicon coating hot forming steel, and the industry and scholars try a plurality of methods. The method for removing the aluminum-silicon coating in advance before welding is one of the main technologies (CN 200780013854.1) applied in the current industrial production, but obviously, the method increases the manufacturing procedures and equipment and also reduces the manufacturing efficiency of the aluminum-silicon coating splice welding plate. The same disadvantages exist with the techniques of removing the coating by plasma ablation (CN 201810223902. X) and high energy electron beam (CN 201810581119.0). Secondly, the method for improving the mechanical properties of the welding seam by optimizing the welding process also attracts attention of a plurality of expert scholars, and the (CN 201910949005.1) patent proposes to adopt pulse laser welding to promote the uniform distribution of coating elements in a molten pool, and the patents such as CN201180034151.3, CN201611036496.3, CN201810507547.9 and the like regulate and control the distribution of the welding seam elements by swinging laser, double-beam laser and the like. The method has higher requirements on the laser, and the process can influence the welding speed, so that the improvement of the production efficiency is not facilitated. Disclosure of Invention The invention aims to solve the problems and the defects in the background art and provides a hydrogen embrittlement resistant welding wire for welding ultrahigh-strength aluminum-silicon coating hot forming steel and a welding method. The hydrogen embrittlement resistant welding wire for the ultra-high strength aluminum-silicon coating hot forming steel splice welding comprises the following components in percentage by mass: C:≤0.1%; Ni:5.0%~7.0%; Mo:0.3%~0.6%; 0.08% -0.12% of Nb, and Mo, nb and C react to form Mo 2 C/NbC nano-phase fixed free hydrogen; v is 0.05% -0.1%, and VC nano-phase fixed free hydrogen is formed through reaction; La:0.5%~0.8% ; Ce :0.3%~0.5%; Ti:0.1%~0.5%; The balance being iron and unavoidable impurities. A hydrogen embrittlement resistance welding method for welding ultra-high strength aluminum-silicon coating hot forming steel comprises the following steps: step one, after purifying the hot forming steel with the aluminum-based or silicon-based coating, placing the hot forming steel at intervals to form gaps between the hot forming steel with the aluminum-based or silicon-based coating; Filling a hydrogen embrittlement resistant welding wire for welding the hot forming steel with the ultrahigh strength aluminum-silicon coating into the gap to obtain the hot forming steel welding plate with the aluminum-silicon coating; During welding, laser beam welding is adopted, the welding speed A is 4-8 m/min, the swing frequency of the laser beam is 100-300 Hz, the pulse wire feeding speed is 2-10 m/min, and the pulse wire feeding frequency is 5-15 Hz. Preferably, the relation between the oscillation frequency of the laser beam and the welding speed A is satisfiedWherein Fre (L) is the oscillation frequency of laser beam, and the pulse wire feeding frequency and the welding speed A meetWhere Fre (W) is the pulse wire feed frequency. Preferably, the swing amplitude is 0.5mm, the total swing width is 1.0mm, and the pulse wire feeding speed is 2-10 m/min. Preferably, the laser welding power adopts a ladder control strategy, wherein 0-2s is 7.0-8.0kW,2-12s is 6.0-6.5kW, and 12-15s is 5.5kW. Preferably, the method further comprises a step three of heating the welding line area by adopting rectangular laser spots, wherein the laser power is 1-6kW, and the laser speed is 2-6m/min. And preferably, the method further comprises the step of carrying out local rapid cooling on the welding surface in a liquid nitroge