为了促进船用高强钢结构激光焊接技术发展,利用光纤激光对8 mm厚的10CrSiNiCu钢板进行了填丝对接焊接。分析了焊接接头的微观组织形貌与硬度、拉伸、弯曲和冲击等力学性能,研究了焊接热输入对接头组织与性能的影响。结果表明,10CrSiNiC...为了促进船用高强钢结构激光焊接技术发展,利用光纤激光对8 mm厚的10CrSiNiCu钢板进行了填丝对接焊接。分析了焊接接头的微观组织形貌与硬度、拉伸、弯曲和冲击等力学性能,研究了焊接热输入对接头组织与性能的影响。结果表明,10CrSiNiCu钢激光焊焊缝区组织主要为马氏体+铁素体+贝氏体;热影响区粗晶区组织主要为块状铁素体+粒状贝氏体+马氏体。焊接接头硬度分布不均匀,焊缝区硬度最高,热影响区次之。当焊接线能量从5.00 k J/cm降至3.64 k J/cm时焊缝区硬度从346 HV增加至396 HV。接头拉伸试样均断裂在母材。3倍板厚压头作用下焊接试样可正向弯曲约113°,比母材降低近60°。熔合线和焊缝区的低温(-40℃)冲击功随着焊接热输入的增加而先增加后减小,在E=4.20 k J/cm时熔合线和焊缝区的冲击功最高,分别达到95 J和101 J,冲击试样断口均呈韧性断裂特征。展开更多
The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the opti...The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the optimal contents of alloying elements in welding wires can improve the low-temperature impact toughness of weld metals because the proeutectoid ferrite and bainite formations can be suppressed, and the fraction of acicular ferrite increases. However, the contents of alloying elements need to vary along with the welding heat input. With the increase in welding heat input, the contents of alloying elements in welding wires need to be increased accordingly. The microstructures mainly consisting of acicular ferrite can be obtained in weld metals after four-wire submerged arc welding using the wires with a low carbon content and appropriate contents of Mn, Mo, Ti-B, Cu, Ni, and RE, resulting in the high low-temperature impact toughness of weld metals.展开更多
According to the study of the microstructure and properties of X100 pipeline steel, the welding consumable-wire based on Mn-Ni-Mo-B-Ti alloy system was successfully designed and developed. The yield strength of the de...According to the study of the microstructure and properties of X100 pipeline steel, the welding consumable-wire based on Mn-Ni-Mo-B-Ti alloy system was successfully designed and developed. The yield strength of the deposited metal of the developed welding wire was 695 MPa, the tensile strength was 810 MPa, and Charpy impact energy was 92 J at negative 20 ℃ when matching with BSG-SJ101H1 sintered flux. The results of the weldability test for X100 pipeline steel which adopting this developed wire showed that the tensile strength of the weld was 827 MPa, 185 J of Charpy impact energy（ -10 ℃ ） , 97% of section of shear and the weld had good strength and toughness matching when the welding speed got to 1.7 m/min. The microstructure and fracture appearance of the weld were analyzed by using metallographic microscope, scanning electron microscope （SEM） and laser confocal microscope, the results indicated that the microstructure was mainly granular bainite in the weld metal, and the fracture was dimple with 200 - 300 μm depth presenting a typical ductile fracture characteristics. The test of welding wire with different content of Ni and Cr element indicated that Ni was better than Cr in improving the strength and toughness of weld metal.展开更多
用φ4.0 mm 70号钢丝通过电阻对焊成环形的某批汽车零件,在焊接打磨后部分零件的焊缝区出现裂纹。通过化学成分分析、硬度测试和断口分析等方法对裂纹产生原因进行了分析。结果表明:裂纹是由于焊接时电极夹持力不足,没有充分将杂质挤出...用φ4.0 mm 70号钢丝通过电阻对焊成环形的某批汽车零件,在焊接打磨后部分零件的焊缝区出现裂纹。通过化学成分分析、硬度测试和断口分析等方法对裂纹产生原因进行了分析。结果表明:裂纹是由于焊接时电极夹持力不足,没有充分将杂质挤出,使焊接后零件内部残留有氧化物引起的。经调整电极夹持力、改变切刀刃口形状及调整回火温度等工艺参数后,杜绝了裂纹的产生,零件各项焊接性能指标均达到了图纸要求。展开更多
文摘为了促进船用高强钢结构激光焊接技术发展,利用光纤激光对8 mm厚的10CrSiNiCu钢板进行了填丝对接焊接。分析了焊接接头的微观组织形貌与硬度、拉伸、弯曲和冲击等力学性能,研究了焊接热输入对接头组织与性能的影响。结果表明,10CrSiNiCu钢激光焊焊缝区组织主要为马氏体+铁素体+贝氏体;热影响区粗晶区组织主要为块状铁素体+粒状贝氏体+马氏体。焊接接头硬度分布不均匀,焊缝区硬度最高,热影响区次之。当焊接线能量从5.00 k J/cm降至3.64 k J/cm时焊缝区硬度从346 HV增加至396 HV。接头拉伸试样均断裂在母材。3倍板厚压头作用下焊接试样可正向弯曲约113°,比母材降低近60°。熔合线和焊缝区的低温(-40℃)冲击功随着焊接热输入的增加而先增加后减小,在E=4.20 k J/cm时熔合线和焊缝区的冲击功最高,分别达到95 J和101 J,冲击试样断口均呈韧性断裂特征。
基金supported by the Research and Development Project of Science and Technology of Hebei Province, China (No.03212211D and No.002121186D)
文摘The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the optimal contents of alloying elements in welding wires can improve the low-temperature impact toughness of weld metals because the proeutectoid ferrite and bainite formations can be suppressed, and the fraction of acicular ferrite increases. However, the contents of alloying elements need to vary along with the welding heat input. With the increase in welding heat input, the contents of alloying elements in welding wires need to be increased accordingly. The microstructures mainly consisting of acicular ferrite can be obtained in weld metals after four-wire submerged arc welding using the wires with a low carbon content and appropriate contents of Mn, Mo, Ti-B, Cu, Ni, and RE, resulting in the high low-temperature impact toughness of weld metals.
文摘According to the study of the microstructure and properties of X100 pipeline steel, the welding consumable-wire based on Mn-Ni-Mo-B-Ti alloy system was successfully designed and developed. The yield strength of the deposited metal of the developed welding wire was 695 MPa, the tensile strength was 810 MPa, and Charpy impact energy was 92 J at negative 20 ℃ when matching with BSG-SJ101H1 sintered flux. The results of the weldability test for X100 pipeline steel which adopting this developed wire showed that the tensile strength of the weld was 827 MPa, 185 J of Charpy impact energy（ -10 ℃ ） , 97% of section of shear and the weld had good strength and toughness matching when the welding speed got to 1.7 m/min. The microstructure and fracture appearance of the weld were analyzed by using metallographic microscope, scanning electron microscope （SEM） and laser confocal microscope, the results indicated that the microstructure was mainly granular bainite in the weld metal, and the fracture was dimple with 200 - 300 μm depth presenting a typical ductile fracture characteristics. The test of welding wire with different content of Ni and Cr element indicated that Ni was better than Cr in improving the strength and toughness of weld metal.
文摘用φ4.0 mm 70号钢丝通过电阻对焊成环形的某批汽车零件,在焊接打磨后部分零件的焊缝区出现裂纹。通过化学成分分析、硬度测试和断口分析等方法对裂纹产生原因进行了分析。结果表明:裂纹是由于焊接时电极夹持力不足,没有充分将杂质挤出,使焊接后零件内部残留有氧化物引起的。经调整电极夹持力、改变切刀刃口形状及调整回火温度等工艺参数后,杜绝了裂纹的产生,零件各项焊接性能指标均达到了图纸要求。
