激光焊接技术改进对衔铁焊接质量影响的实验研究  

A experimental study on the effect of the welding quality of the keeper by improving laser welding technique.

作　　者：杜莉[1] 钟惠兰[1] 林川[1] 

机构地区：[1]四川大学华西口腔医学院修复科,四川成都610041

出　　处：《临床口腔医学杂志》2008年第3期149-152,共4页Journal of Clinical Stomatology

摘　　要：目的:探讨激光焊接技术的改进对磁性附着体衔铁与基桩焊接质量的影响,为临床应用提供实验依据。方法:采用Nd:YAG激光点焊机,以牙科高熔钴铬合金为基体金属对W600型磁性附着体成品衔铁进行焊接。试件分3组,分别作焊接面坡口和无坡口的设计以及不同焊接参数的设置。对焊接后3组试件的表面、显微结构、纵剖面等进行观察,比较焊接质量。结果:坡口组焊接深达全层,焊接缺陷较少;无坡口组焊接深度较浅。3组试件均未发现明显的热影响区以及过高显微硬度的淬硬组织。结论:焊接面的坡口设计,增加了焊接深度,提高了焊接质量。本实验条件下所增加的激光强度有利于焊接质量的提高。Objective：In order to compare the different interface designs and welding conditions on their effects on the welding quality and provide experimental data for clinical application. Method： The keepers of the W600 magnetic attachments were welded onto the cast dowel-copings made by Co-Cr alloy using a Nd：YAG laser-spot-welding apparatus. 15 pairs of keepers and dowel-copings specimens were separated into 3 groups based on their different interface designs and laser welding. The surface and internal structures and characteristics of the specimens were observed under a metallographic microscope and a microhardness tester. Result：Under the metallographic microscope, the fusion area reached the bottom of the keepers in group A and B. But in group C,it only penetrated into 1/3～1/2 of that depth. Compared with the other two,the group B had the best welded interface with the minimal amount of defects. As for the surface characteristics, there were no excessive microhardness increase around the fusion area in all 3 groups. Conclusion：The groove design on the welded interface created a path for the laser beam to reach the bottom of the keeper and the welding quality was improved. In this study,change of the laser-welding parameters improve the welding quality.

关 键 词：激光焊接 衔铁 坡口 焊接参数 

分 类 号：R783.2[医药卫生—口腔医学]