本文分析了钎焊焊缝强度下降的原因，并提出改进措施。
This paper analyses the cause of strength descent of brazing weld, and proposes improving measures.
钎焊焊缝的枝晶间显微疏松导致的应力集中与微裂纹效应以及近焊缝区母材晶粒长大是导管早期疲劳开裂的主要原因。
The results show that the crack initiates at the outer surface of the weld comer and propagates into the steel base material with a high cycle fatigue mode.
而定位格架的表面颜色、钎焊缝质量、外形尺寸、破断力和结合层厚度均达到钎焊技术要求。
The grids completely meet with the requirements for soldering on surface color , welds quality, overall dimension, rupture stress and joint thickness.
通过对硬质合金、截齿体材质、焊缝间隙、钎焊及热处理工艺的研究，寻找出了研制优质强力截齿的技术途径。
The technology of developing quality and strong pick is found by researching the hard metal alloy, pick-body material, weld gap, technique of braze welding and heat treatment.
硬质合金钎焊后进行淬火、回火处理，焊缝强度明显下降。
After cemented carbide brazed is quenched and tempered, the strength of welding stam descend obviously.
结果表明，采用椭圆形光斑和矩形光斑进行激光填丝熔钎焊均可获得较满意的焊缝成形。
Experimental results show that both ellipse spot and rectangular beam can gain the good weld appearance.
真空钎焊缝中主要缺陷为未钎透，并对条状未钎透和网状未钎透进行了分析。
The main defect in vacuum brazing Joints is that the filler metal does not penetrate…
真空钎焊缝中主要缺陷为未钎透，并对条状未钎透和网状未钎透进行了分析。
The main defect in vacuum brazing Joints is that the filler metal does not penetrate…
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