摘要
通过研究铂铱合金与316L不锈钢丝材微激光点焊接头的表面形貌、接头断口中气孔的形态以及横截面中气孔的分布情况,对接头气孔的形成机理进行了分析。结果表明:不锈钢合金元素在焊接熔池区择优气化引起气孔;铂铱合金熔池的高温使得不锈钢合金元素在熔池中的溶解度降低,铂铱合金的高导热性及微激光焊接的特点使得熔池的凝固速度加快,从而形成气孔。
The porosity formation mechanism of the laser spot mierowelded joints between Pt-Ir alloy and 316L stainless steel wires was investigated by characterizing the weld geometry,morphology and distribution of porosity in cross sections.The porosity is believed to be a result of preferential vaporization of stainless steel alloying elements spread into weld pool.Porosity is also attributed to low solubility of stainless steel alloying elements in weld pool due to its high temperature.In addition,the solidification process is speeded up by high heat conductivity of Pt-Ir alloy as well as characteristics of laser microwelding,and the porosity is formed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期2079-2082,共4页
Rare Metal Materials and Engineering
基金
先进焊接与连接国家重点实验室开放课题研究基金(AWJ-M13-09)
关键词
微激光点焊
气孔
形成机理
铂铱合金
laser microwelding
porosity
formation mechanism
Pt-Ir alloy
