CAJ | 학술논문

燃油-液压油散热器在使用过程中发生了泄漏。通过宏微观形貌观察、金相检查和焊缝熔深测试，确定了燃油-液压油散热器的泄漏性质及原因。结果表明：出口封头与壳体焊缝处的周向裂纹为疲劳裂纹，未焊合焊接缺陷的存在是导致其疲劳开裂的原因；壳体拼接焊缝处的轴向裂纹也为疲劳裂纹，焊接气孔缺陷的存在和焊缝熔深不足是导致其疲劳开裂的原因。燃油-液压油散热器泄漏是由于出口封头与壳体焊缝发生疲劳开裂造成的，壳体拼接焊缝发生疲劳开裂会造成壳体表面出现鼓胀，进一步增加了出口封头与壳体焊缝处的张应力，对最终的散热器泄漏起到促进作用。
연유-액압유산열기재사용과정중발생료설루。통과굉미관형모관찰、금상검사화한봉용심측시，학정료연유-액압유산열기적설루성질급원인。결과표명：출구봉두여각체한봉처적주향렬문위피로렬문，미한합한접결함적존재시도치기피로개렬적원인；각체병접한봉처적축향렬문야위피로렬문，한접기공결함적존재화한봉용심불족시도치기피로개렬적원인。연유-액압유산열기설루시유우출구봉두여각체한봉발생피로개렬조성적，각체병접한봉발생피로개렬회조성각체표면출현고창，진일보증가료출구봉두여각체한봉처적장응력，대최종적산열기설루기도촉진작용。
A fuel-hydraulic oil radiator was found to leak in use. The failure mode and cause were analyzed by macro and micro observation, microstructure examination and welding depth testing. The results show that the circumferential welding crack between output head and shell body is fatigue crack, which was caused by incomplete fusion welding defects. The axial welding crack of shell body is fatigue crack, which was caused by welding porosity and unqualified melting depth. The leak of the fuel-hydraulic oil radiator was caused by the welding fatigue crack between output head and shell body. The shell body welding fatigue crack brought in larger pressure and tympany, which promoted the leakage of the radiator.