焊接学报 >

2023 , Vol. 44 >Issue 10: 49 - 56

DOI: https://doi.org/10.12073/j.hjxb.20230307002

增材制造与先进再制造技术

宽高比对激光熔覆道间熔合不良的影响机制及改善策略

  • 杨高林 ,
  • 郑权航 ,
  • 钱浩凯 ,
  • 樊文 ,
  • 张群莉 ,
  • 石岳林 ,
  • 姚建华
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  • 1. 浙江工业大学, 激光先进制造研究院, 杭州, 310023;
    2. 高端激光制造装备省部共建协同创新中心, 杭州, 310023;
    3. 舟山市鼎尊智能科技有限公司, 舟山, 316031
杨高林,博士;主要研究方向为激光熔覆技术;Email:ygaolin@163.com

收稿日期: 2023-03-07

  网络出版日期: 2024-01-16

基金资助

国家自然科学基金资助项目(52035014)；浙江省“领雁”研发攻关计划资助项目(2022C01117)；浙江省基础公益研究计划资助项目(LGG22E050036)；舟山市科技合作资助项目(2023C13011).

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Influence mechanism and improvement strategy of aspect ratio on the poor fusion between laser cladding channels

  • YANG Gaolin ,
  • ZHENG Quanhang ,
  • QIAN Haokai ,
  • FAN Wen ,
  • ZHANG Qunli ,
  • SHI Yuelin ,
  • YAO Jianhua
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  • 1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, 310023, China;
    2. Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou, 310023, China;
    3. Zhoushan Dingzun Intelligent Technology Co., Ltd., Zhoushan, 316031, China

Received date: 2023-03-07

  Online published: 2024-01-16

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摘要

熔合不良是激光熔覆的常见工艺缺陷，为了探索道间搭接时熔合不良的产生机制，设计了单道单层熔覆试验、多道单层熔覆试验、多道重熔试验以及单层尾道重熔试验，并进行了单道熔覆时温度场的模拟仿真. 结果表明，熔合不良缺陷的产生机制是已沉积区域边缘靠上部分形状凸起，激光辐照其表面时散热较慢，较快熔化. 边缘根部激光能量输入较低同时形状内凹，散热较快，较慢熔化，靠上凸起部分熔融液体翻出并越过根部和基材的熔化部分联通，导致熔覆层根部与激光隔绝形成了空隙，产生了熔合不良缺陷；为了减少这种熔合不良缺陷的产生，根据熔合不良的产生机制设计了倾斜熔覆头单层多道搭接试验，结果表明，倾斜熔覆头进行熔覆可以有效减少熔合不良缺陷的产生.

关键词： 熔合不良; 宽高比; 激光熔覆; 增材制造

本文引用格式

杨高林 , 郑权航 , 钱浩凯 , 樊文 , 张群莉 , 石岳林 , 姚建华 . 宽高比对激光熔覆道间熔合不良的影响机制及改善策略[J]. 焊接学报, 2023 , 44(10) : 49 -56 . DOI: 10.12073/j.hjxb.20230307002

Abstract

Poor fusion is a common process defect in laser cladding. In order to explore the mechanism of poor fusion during inter-track overlap, single-track single-layer cladding test, multi-track single-layer cladding test, multi-track remelting test and single-layer tail-track remelting test were designed, and the simulation of temperature field during single-track cladding was carried out. The results show that the formation mechanism of the poor fusion defect is that the upper part on edge of the deposited area is raised, and the heat dissipation is slower and the melting is faster when the laser irradiates its surface. The laser energy input at the edge root is low and the shape is concave. so the heat dissipation is fast and the melting is slow. The molten liquid is turned out by the upper convex part and connected with the molten part of the root and the substrate, resulting in the gap between the root of the cladding layer and the laser, resulting in poor fusion defects. In order to reduce the occurrence of such poor fusion defects, a single-layer multi-pass lap test of the inclined cladding head was designed according to the mechanism of poor fusion. The results show that the inclined cladding head can effectively reduce the occurrence of poor fusion defects.

Key words： poor fusion; width-height ratio; laser cladding; additive manufacturing

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