CAJ | 학술논문

目的测试和分析不同激光焊接条件下3种不同材料的焊接深度、强度和热反应区组织结构的变化。方法对钴铬合金、镍铬合金、纯钛3种测试棒采用不同电压和脉冲持续时间焊接，与对照组进行比较分析。结果电压与钴铬合金、镍铬合金的焊接深度和强度呈正比，均值为：250 v时335 MPa～330 v时573 MPa。热反应区晶粒生长小，激光束终点呈山峰状，中心留有焊接空白区。电压与纯钛的焊接深度呈正比，与其强度呈反比，均值为：250 v时221 MPa～330 v时154 MPa。热反应区晶粒生长较大，伴有相变体膨胀、晶间氧化、组织呈蜂窝状改变。结论激光对钴铬合金、镍铬合金的焊接性能优良，但对铸造后的纯钛焊接性能有待进一步探讨。
목적측시화분석불동격광한접조건하3충불동재료적한접심도、강도화열반응구조직결구적변화。방법대고락합금、얼락합금、순태3충측시봉채용불동전압화맥충지속시간한접，여대조조진행비교분석。결과전압여고락합금、얼락합금적한접심도화강도정정비，균치위：250 v시335 MPa～330 v시573 MPa。열반응구정립생장소，격광속종점정산봉상，중심류유한접공백구。전압여순태적한접심도정정비，여기강도정반비，균치위：250 v시221 MPa～330 v시154 MPa。열반응구정립생장교대，반유상변체팽창、정간양화、조직정봉와상개변。결론격광대고락합금、얼락합금적한접성능우량，단대주조후적순태한접성능유대진일보탐토。
Objective　To analyse and measure the welding depths and strengths of three kinds of welding materials under different laser welding conditions as well as the structural changes of the heat affected zone. Methods　Under different voltages and pulse duration three kinds of measuring sticks, including Co-Cr alloy, Ni-Cr alloy and pure titanium were welded and their strengths were compared with that of control group. At the same time, the structure of the heat-affected zone was analysed by means of the gold-phase method. Results　The welding depth and strength of Co-Cr alloy were in direct proportion to the setting voltage, with averages of 335MPa(250V) to 573MPa(330V). At the heat-affected zone, the crystal particle was small and the end point of welding by laser bean presented the shape of the mountain peak and the interval of finger shape. The center of measuring sticks had a black zone with the circle shape. The setting voltage was in direct proportion to the welding depth of pure titanium and in inverse proportion to the welding strength with averages of 221MPa(250V) to 154MPa(330V). The crystal particle in the heat affected zone grew large and the solid phase expanded, the interval of the crystal oxidised, and the structure showed honeycomb changes. Conclusion　The laser welding is favourable to the welding properties of Co-Cr and Ni-Cr alloys, but its effect on the welding properties of pure titanium needs further discussion.