双熔敷极耐磨堆焊焊条焊接稳定性的分析  

Analysis on welding stability of twin deposition surfacing electrode

作　　者：赵伟[1] 邹勇[1] 邹增大[1] 王育福[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《焊接学报》2013年第6期25-28,114,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金面上资助项目(51171093)

摘　　要：针对φ4.0 mm的双熔敷极耐磨堆焊焊条电弧焊中焊条参数与焊接工艺参数对焊接稳定性的影响进行了研究.结果表明,双熔敷极耐磨堆焊焊条电弧焊电弧电压主要由焊条的双芯间距决定,并受到熔滴过渡、电弧吹力等因素的影响,双芯间距太小或者太大都不利于焊接稳定,当双芯间距为1.0 mm时,电弧电压为33 V左右,焊接稳定性优良;药皮重量系数为45%～56%时,保护效果较好,冶金反应充分,焊接稳定,熔覆层硬度HHRC>6 200 MPa;焊接电流选择180～200 A为宜,这比传统同规格耐磨堆焊焊条焊接电流大且可调范围窄;焊条与工件间的距离为7 mm时,焊接稳定性较好,焊缝与母材熔合良好.The influences of the electrode parameters and welding parameters on the welding stability were investigated with Φ4.0 mm twin deposition surfacing electrode.The results show that the arc voltage was mainly determined by the distance between twin cores,but it was also affected by the droplet transfer and arc force.Welding with too small or too large distance between twin cores degraded the welding stability.When the distance between twin cores was 1.0 mm and the arc voltage was kept at around 33 V,the welding process was stable.When the weight coefficient of the coating was 45%-56%,the hardness of the cladding layer was over 6 200 MPa,with good protection and sufficient metallurgical reaction in the weld.The appropriate welding current should be controlled between 180-200 A,which was higher in magnitude but narrower in amplitude than that with traditional hard surfacing electrodes under the same specification.When the distance between the electrode and workpiece was 7 mm,excellent bonding between the weld and base metal was obtained with stable welding process.

关 键 词：双熔敷极耐磨堆焊焊条 电弧电压 焊接稳定性 

分 类 号：TG444[金属学及工艺—焊接]