DH36钢湿法焊条多层多道焊海试结果分析

Analysis of sea test results of underwater wet multi-pass welding of DH36

通过对潜水员焊工的培训,成功实现了不同接头形式的水下湿法手工多层多道焊,并且在渤海海域的11,22 m两个水深分别进行了对接接头平焊、搭接接头横焊及立焊和T形接头立焊及船形位置焊的焊接试验.结果表明,在两种水深的对接接头和搭接接头中都未发现夹渣、气孔及未熔合等缺陷,并且两种水深的对接接头和搭接接头在各项力学性能指标上都满足AWS D3.6 M:2010关于B级接头的要求.与11 m水深的焊缝相比,22 m水深的焊缝柱状晶区的针状铁素体减少,块状铁素体明显增多.两种水深接头的热影响区粗晶区组织差异不大,主要由板条状马氏体组成.

In this paper,underwater wet manual multi-pass welding of different joint types was successfully completed through the diver welders after training.Butt joints in the flat position,lap joints in the horizontal and vertical positions,and T-joints in the vertical and flat positions were obtained under 11 m and 22 m water depths in the Bohai Sea.The test results indicate that all of the indexes of the joints welded at 11 m and 22 m water depths meet the requirements of the Class B Weld according to AWS D3.6 M:2010.Compared with the joints welded at 11m water depth,the microstructures in the weld seam obtained at 22m depth have much more block ferrite and less amounts of acicular ferrite.The coarse-grained heat-affected zones of the joints at the two water depths are mainly composed of lath martensite.