Study on Forming Law of Backside Weld of 10 Million Watt Level Scanning Laser Welding

LI Lin; LEI Zhen; SUN Qian; CAO Hao; ZHAO Demin

doi:10.7512/j.issn.1001-2303.2023.04.13

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Study on Forming Law of Backside Weld of 10 Million Watt Level Scanning Laser Welding
Vol. 53, Issue 4, Pages: 112-119(2023)
Received：10 March 2023，

Published：20 April 2023
DOI： 10.7512/j.issn.1001-2303.2023.04.13
稿件说明：

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李林，雷振，孙谦，等.万瓦级扫描激光焊接背面焊缝成形规律研究［J］.电焊机，2023，53（4）：112-119. DOI： 10.7512/j.issn.1001-2303.2023.04.13.

LI Lin, LEI Zhen, SUN Qian, et al.Study on Forming Law of Backside Weld of 10 Million Watt Level Scanning Laser Welding[J].Electric Welding Machine, 2023, 53(4): 112-119. DOI： 10.7512/j.issn.1001-2303.2023.04.13.

摘要

采用穿透式扫描激光不开坡口焊接方法对8 mm厚碳钢进行了万瓦级激光焊接试验，分析了激光功率、焊接速度、离焦量、扫描幅度和扫描频率对焊缝背面成形的影响。结果表明，当焊接速度为0.9 m/min、1.2 m/min时，在扫描激光作用下熔池受表面张力与重力平衡，获得了背面成形均匀、连续、根部熔透良好，背面余高合适的焊缝；随着离焦量从-10 mm到+10 mm变化，负离焦相较于正离焦焊缝成形更连续均匀，背部余高在1.2~1.5 mm；改变扫描幅度与扫描频率时，扫描频率大于300 Hz、幅度大于2 mm时焊缝部分未熔透，扫描频率为200 Hz、扫描幅度为1 mm 时焊缝成形较好；焊接热输入和离焦量对焊缝背面成形的影响作用大于扫描频率和扫描幅度。通过提高焊接速度、选用-10~0 mm之间离焦量、liner（垂直）扫描方式、200 Hz扫描频率、1 mm或2 mm扫描幅度可获得均匀、连续、根部熔合良好的背面焊缝成形。

Abstract

The effects of laser power

welding speed

defocus

scanning amplitude and scanning frequency on backside forming of 8 mm carbon steel were systematically studied by using the penetrating scanning laser without opening welding method. The results show that under the conditions of welding speed of 0.9 m/min and 1.2 m/min

the weld pool is balanced by surface tension and gravity under the action of scanning laser

and the weld with uniform forming and continuous back

good root penetration and proper back residual height is obtained. With the change of defocusing distance from -10 mm to +10 mm

negative defocusing distance is more continuous and uniform than positive defocusing distance

and the residual height of back is from 1.2 mm to 1.5 mm. When the welding power

welding speed and defocusing distance were fixed and only scanning mode was changed for comparison test

liner (vertical) scanning mode obtained the best effect under several scanning modes in comparison experiment. Scanning amplitude and scanning frequency were changed

and the weld was partially penetrated or not penetrated when scanning frequency was greater than 300 Hz and the amplitude was greater than 2 mm. Scanning amplitude is 200 Hz

scanning amplitude is 1 mm when the forming is better

and the weld back forming effect welding heat input > defocusing distance > scanning frequency > scanning amplitude. Therefore

by increasing the welding speed

choosing the defocusing distance between -10 mm and 0 mm

liner (vertical) scanning mode

200 Hz scanning frequency

1 mm or 2 mm scanning amplitude

uniform

continuous and well-integrated single-side welding back shape of 8 mm carbon steel plate can be obtained.

关键词

Keywords

references

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