焊药混合时间对铜及铜合金手工自蔓延焊接的影响

Effect of the powder mixing time on copper and copper alloy's manual SHS welding

铜及铜合金手工自蔓延焊接是一种融合自蔓延焊接和手工弧焊等技术的新型应急焊接技术。手工自蔓延焊接的质量控制和焊接接头性能会受到燃烧型焊条成形工艺参数的影响,而焊药混合时间又是焊条成形工艺参数中重要的因素。通过试验研究了颗粒团聚与混料时间的关系,不同混料时间下粉末颗粒分布情况,焊条燃烧速度与混料时间的关系曲线,并且通过金相显微镜观察了α+β+β'相的分布情况,分析了β'相的存在对焊缝组织成分和力学性能的影响,从而影响到最终的焊接质量。实验结果表明:焊药混合时间为30～45 min时,燃烧型焊条燃速可控,力学性能好,晶粒细化分布均匀,焊接质量高。

Copper and copper alloy＇s manual SHS welding is a new emergency welding technology,which is based on self-propagating high-temperature synthesis（SHS） theory and manual arc welding technique of copper and copper alloy.The quality control and mechanical properties of the weld joint were affected greatly by the welding rod forming technological parameter,of which powder mixing time is one of the important elements.The paper studies the relation between the grain aggregation and the mixing time,the powder particle distribution with the change of the mixing time and the relation between the combustion velocity of the rod and the mixing time. Distribution situation of Phase α ＋ β ＋β ＇were observed through the metallographic microscope,then the effect of the phase β ＇on the structure and mechanical properties were analyzed.The conclusion was that when the power＇s mixing time was between 30 and 45 minutes,the combustion speed of the weld rod was under control,it has good mechanical properties,grain refinement,uniform distribution and better weld quality.