To improve the welding efficiency of conventional arc welding, triple-electrode fillet welding was proposed and developed. Stability of triple-electrode fillet welding process is the assurance for ideal joint. The eva...To improve the welding efficiency of conventional arc welding, triple-electrode fillet welding was proposed and developed. Stability of triple-electrode fillet welding process is the assurance for ideal joint. The evaluation model for arc fluctuations of triple-electrode fillet welding was established based on the characteristic parameters and their variation coefficients. This model indicated that variation coefficients could reflect arc voltage flnctuations of welding process, and its analysis result was consistent with the actual welding process.展开更多
The aim of this work is to establish the influence of the relative position of the alloy charge C-Cr-Mn in the structure of the coating of rutile electrodes for hardfacing,on the operational behavior(arc stability).Fo...The aim of this work is to establish the influence of the relative position of the alloy charge C-Cr-Mn in the structure of the coating of rutile electrodes for hardfacing,on the operational behavior(arc stability).For this,three variants of electrodes with similar chemical composition are elaborated in the metallic core and the coating,differentiating only in the relative position that occupies the alloy charge(C-Cr-Mn)in the structure of the coating:internal,external and homogeneous.For the development of the research,a completely random design is used.The operative characterization of the electrodes is performed in terms of the arc stability.In conclusion,it can be seen that the position of the alloy load influences the operation behavior(stability of the arc).The variant of internal alloy charge in the coating presents the better arc stability performance.展开更多
针对离心压缩机叶轮制造用KMN钢的低温工作条件,研究了KMN钢的焊接工艺和焊后热处理技术.通过拉伸试验、低温冲击试验及显微组织观察等手段表征了焊接参数及焊后热处理技术对焊接接头性能的影响.结果表明,在相同的热处理状态下,当线能量...针对离心压缩机叶轮制造用KMN钢的低温工作条件,研究了KMN钢的焊接工艺和焊后热处理技术.通过拉伸试验、低温冲击试验及显微组织观察等手段表征了焊接参数及焊后热处理技术对焊接接头性能的影响.结果表明,在相同的热处理状态下,当线能量为14.4 k J/cm时,焊接接头的性能最好.在线能量相同的情况下,随着回火温度的提高,焊接接头的屈服强度和抗拉强度均有所下降,而低温冲击功先上升后下降.采用E9018-B3L-Ni焊条焊接的KMN钢可满足-50℃低温工况的使用要求.展开更多
基金The research is supported by the National Natural Science Foundation of China （Grant No. 51275299）
文摘To improve the welding efficiency of conventional arc welding, triple-electrode fillet welding was proposed and developed. Stability of triple-electrode fillet welding process is the assurance for ideal joint. The evaluation model for arc fluctuations of triple-electrode fillet welding was established based on the characteristic parameters and their variation coefficients. This model indicated that variation coefficients could reflect arc voltage flnctuations of welding process, and its analysis result was consistent with the actual welding process.
文摘The aim of this work is to establish the influence of the relative position of the alloy charge C-Cr-Mn in the structure of the coating of rutile electrodes for hardfacing,on the operational behavior(arc stability).For this,three variants of electrodes with similar chemical composition are elaborated in the metallic core and the coating,differentiating only in the relative position that occupies the alloy charge(C-Cr-Mn)in the structure of the coating:internal,external and homogeneous.For the development of the research,a completely random design is used.The operative characterization of the electrodes is performed in terms of the arc stability.In conclusion,it can be seen that the position of the alloy load influences the operation behavior(stability of the arc).The variant of internal alloy charge in the coating presents the better arc stability performance.
文摘针对离心压缩机叶轮制造用KMN钢的低温工作条件,研究了KMN钢的焊接工艺和焊后热处理技术.通过拉伸试验、低温冲击试验及显微组织观察等手段表征了焊接参数及焊后热处理技术对焊接接头性能的影响.结果表明,在相同的热处理状态下,当线能量为14.4 k J/cm时,焊接接头的性能最好.在线能量相同的情况下,随着回火温度的提高,焊接接头的屈服强度和抗拉强度均有所下降,而低温冲击功先上升后下降.采用E9018-B3L-Ni焊条焊接的KMN钢可满足-50℃低温工况的使用要求.
