通过对最近的一次断裂拉杆现场调查和宏观断口分析，发现断裂发生在拉杆的补焊焊缝熔合线附近。
Based on the fracture site investigation and macro-rod fracture analysis, the welding rod fracture occurred in the vicinity of the weld fusion line.
X65管线钢在焊接过程中，内侧焊缝金属出现横向和纵向沿熔合线方向的裂纹，横向裂纹贯穿焊缝金属横截面。
The longitudinal cracks along bond line and the transverse cracks which cut across the weld metal cross section inside weld metal were formed, while X65 pipe line steel was welding.
焊接接头的拉伸试验断裂部位在焊缝。焊接HAZ熔合线附近的硬度值最高，远离熔合线硬度降低，并逐渐接近母材金属的硬度。
The tensile test fracture area locates on weld seam, and the hardness near HAZ fusion line is the highest, away from the fusion line, the hardness declines and reach the parent metal hardness.
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