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本工作根据实际试样在手工施焊过程中接头区各部位温度的变化规律,采用焊接热循环的模拟技术分别制备了焊接热影响区(HAZ)中不同部位的试样,用极化行为测定和与母材构成的电偶腐蚀电流测定等电化学方法,评定其耐蚀性.发现厚度为8 mm 的碳钢钢板在输入能量线密度 E=18000～18600J/cm 的条件下,HAZ 中的不全完正火区具有更大的腐蚀倾向。这可能就是造成焊接接头区沟状腐蚀的原因。
In this work, according to the variation rule of the temperature of the joints in the process of manual welding, the samples of different parts in the heat-affected zone (HAZ) were prepared respectively by the simulation technology of welding thermal cycle, And galvanic corrosion current measurement with the parent material and other electrochemical methods to evaluate its corrosion resistance found in the thickness of 8 mm carbon steel plate in the input energy linear density E = 18000 ~ 18600J / cm conditions, the HAZ Incomplete fire zone has a greater tendency to corrosion. This may be the reason for the groove-like corrosion of the welded joints.