针对某型非标准波导管使用中发现90°波导弯头钎焊接头处存在裂纹的问题, 运用X光检测和扫描电镜分析等手段, 对裂纹产生的原因进行了分析。结果表明: 在波导管加工过程中, 线切割后的焊接面形成一层氧化膜, 由于钎焊前清洗不彻底, 在焊接时焊料无法粘结, 造成钎料未钎满; 另波导管在焊接时定位不准, 偏向一边, 造成单边间隙过小, 焊料不能充分流入, 使得波导管在焊接过程中焊料未能充分渗透、填满。根据故障原因, 采取了相应的改进措施, 使钎焊接头裂纹问题得到了解决。

Means such as X-ray detection and scanning electronic microscope analysis were used to analyze the cracks formation reason on soldered joints of 90°wave-guide flanged bend of non-standard wave-guide tube. The results indicate that during manufacturing process of the wave-guide tube, a layer of oxidation film formed on the solder surface after wire cutting, and owing to incompletely cleaning out of the film, the solder could not be felted, which resulted in the not full soldering. Besides, during the soldering process, the orientation of the wave-guide tube was not precise and leaned to one side, which made the one side clearance too small and the solder could not be poured in completely, thus causing the problem that the solder could not penetrate and be filed out fully during soldering process. According to the cause of trouble, relevant improving measures had been taken, which was proved to meet with the using requirement after relevant demonstration experiment. The problem of cracks on soldered joints was solved.