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摘要: 为探索12 mm厚DH36船用耐蚀钢对接用光纤激光-MIG复合焊接工艺，分析了四种不同送丝速度对接头成形、微观组织、拉伸性能及腐蚀性能的影响. 结果表明，在送丝速度为8.5 m/min时可获得成形优良的接头，随着送丝速度的增加，电弧区和激光区焊缝的熔宽均增加. 焊缝区主要由针状铁素体、先共析铁素体和一定量的贝氏体组成，送丝速度对针状铁素体的形态和数量有显著的影响. 增加送丝速度对接头抗拉强度的影响不大，但减小了延伸率，接头延伸率最高达16.5%. 接头极化曲线测试表明，当送丝速度为7.5 m/min时，自腐蚀电流密度最小，腐蚀倾向最低.
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图 2 不同送丝速度下接头的熔宽、余高和电弧区熔深变化
Figure 2. Weld bead dimensions at different filler wire speeds
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图 4 不同送丝速度焊缝的微观组织
Figure 4. Microstructures of the welds at different filler wire speeds
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图 5 不同送丝速度下接头HAZ的组织形貌
Figure 5. Microstructures of heat affected zone at different filler wire speeds
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图 6 不同送丝速度下接头的拉伸性能
Figure 6. Tensile properties of the welded joints at different filler wire speeds
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图 7 不同送丝速度下接头的显微硬度
Figure 7. Micro-hardness of the welded joints at different filler wire speeds
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图 8 不同送丝速度下接头的极化曲线
Figure 8. Polarization curves of the welded joints at different filler wire speeds
表 1 DH36钢及焊丝的化学成分(质量分数，%)
Table 1 Chemical compositions of experiment steel and filler wire
C Si Mn P S Al Ti Sb Cu Ni Cr 母材 0.098 0.28 1.08 0.011 0.002 0.025 0.014 0.082 0.024 1 0.247 — 焊丝 0.061 0.47 1.45 0.010 0.002 0.022 0.012 0.081 0.024 2 0.200 — 
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表 2 不同送丝速度下焊缝电化学参数拟合结果
Table 2 Fitting results of electrochemical parameters of welded joints at different filler wire speeds
送丝速度v/(m∙min−1) 自腐蚀电位ESCE/V 自腐蚀电流logI(μA∙cm−2) 7.0 -0.4995 70.7946 7.5 -0.4802 42.6580 8.0 -0.4914 51.2861 8.5 -0.4913 53.7032
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