CAJ | 학술논문

潜水焊工在水深2 m 的水池里，使用水下专用焊条进行 DH36试板湿法焊接试验。根据 AWS D3.6：2010，对所得到的焊接接头进行焊接工艺评定，并分析其组织及潜在缺陷。结果表明：湿法接头的外观检测、X 射线检测、拉伸试验、弯曲试验、冲击试验和宏观试验均满足 AWS D3.6：2010 B 级接头要求，盖面焊缝的过热区最大硬度值微超出标准规定的上限，其组织主要为粗大马氏体，而打底焊缝的热影响区由于后续焊道的再热作用，组织为回火马氏体。在盖面焊缝下方左右热影响区容易出现氢致裂纹，可通过使用 step - back 运条手法来解决。
잠수한공재수심2 m 적수지리，사용수하전용한조진행 DH36시판습법한접시험。근거 AWS D3.6：2010，대소득도적한접접두진행한접공예평정，병분석기조직급잠재결함。결과표명：습법접두적외관검측、X 사선검측、랍신시험、만곡시험、충격시험화굉관시험균만족 AWS D3.6：2010 B 급접두요구，개면한봉적과열구최대경도치미초출표준규정적상한，기조직주요위조대마씨체，이타저한봉적열영향구유우후속한도적재열작용，조직위회화마씨체。재개면한봉하방좌우열영향구용역출현경치렬문，가통과사용 step - back 운조수법래해결。
DH36 test plates were wet welded using underwater special electrode by underwater welders at the pool of a depth of two me-ters. The resultant welding joints was for welding procedure qualification according to AWS D3. 6:2010 and to analyze the microstruc-tures and potential defects. The results showed that,visual inspection and X - ray detection,tensile test,bending test,impact test, the macro test met the requirements of AWS D3. 6:2010 class B joint. Maximum hardness value of overheated zone in the cap weld was beyond the standard micro - cap,the microstructure of coarse martensite mainly,while overheated zone of backing weld becomes tem-pered martensitedue to subsequent weld reheat role. Also pointed out that HAZ around the bottom of the cap weld is prone to hydrogen induced cracking,and the problem can be solved using the step - back techniques.