摘要缆式焊丝气保焊是近年来出现的一种创新型焊接方法，具有高效、节能、优质 等优点，其设备简单、易实现焊接自动化，尤其适合船舶厚板焊接。关于缆式焊丝 气保焊的研究主要集中在焊接温度场、应力场和高效节能方面的研究，对熔滴过渡 的研究只是停留在特定焊接参数下的熔滴过渡方式，所以对缆式焊丝气保焊熔滴过 渡的深入研究很有意义。81230

本文以Φ3。6mm 药芯缆式焊丝气保焊为研究对象，通过拍摄缆式焊丝气保焊不同 焊接参数下的熔滴过渡，主要围绕缆式焊丝气保焊熔滴过渡进行研究分析，确定了 不同熔滴过渡方式的电流范围，并着重分析了不同熔滴过渡方式在其电流范围内， 随着电流变化的熔滴过渡规律。

分析表明：缆式焊丝气保焊熔滴过渡方式主要有旋转排斥过渡、颗粒过渡、射 滴过渡三种，其电流范围分别是 200A-400A，400A-550A，550A-616A；旋转排斥过 渡时，熔滴在电弧旋转力、表面张力、阳极斑点压力的综合作用下围着焊丝旋转， 熔滴容易被甩出去形成飞溅，随着电流的增加，熔滴开始向下过渡到熔池，熔滴过 渡方式开始向颗粒过渡转变，颗粒过渡时，随着焊接电流的增加，熔滴下落轨迹与 轴线方向的夹角变小，射滴过渡时，随着电流增加，熔滴下落轨迹开始向左偏移。

毕业论文关键词：缆式焊丝；气保焊；电流范围；熔滴过渡

Abstract Cable welding wire(CWW) gas shielded arc welding is a kind of innovative welding method, and it has the advantages of high efficiency, energy saving, high quality。 It is simple and easy to apply for welding automation equipment, especially suitable for thick plate welding of the ship。 The former researches of CWW gas shielded arc welding were mainly concentrated on the welding temperature field, stress field and high efficiency and energy saving, researches on droplet transfer just stayed in certain welding parameters, therefore it is very significant to study droplet transfer of CWW gas shielded arc welding。

Based on Φ3。6mm flux-cored CWW gas shielded arc welding welding wire gas shielded arc welding as research objects, droplet transfer process under different welding parameters were taken by High-speed camera。 Current range of different droplet transfer modes was given, and we especially analyzed the rule of different droplet transfer modes with the change of current in its current range。

Research shows: Droplet transfer modes mainly have rotating repelled transfer, globular  transfer  and  projected  transfer。 The  current  range  of different  droplet transfer

modes is 200A-400A, 400A-550A, 550A-616A, respectively；In repelled transfer, droplet

rotates around the wire under the action of arc rotating force, surface tension and anode spots pressure。 Droplet is easy to be left out to form a splash。 With the increasing of welding current, drop was downward transfered to the pool。 Droplet transfer mode begins to change into globular transfer。 With the increase of welding current, the angle between dropping trajectory of droplet and the direction of the axis becomes smaller。 In projected transfer, with the increase of current, droplet trajectory begins to shift to the left; Setting the unchangeable wire feeding speed, with the increase of preset voltage, the droplet size decreases, and droplet transfer frequency increases。

Keywords: Cable Welding Wire; gas shielded arc welding; Current range;droplet transfer

目 录

第一章 绪论 1

1。1  引言 1

1。2  气保焊熔滴过渡分类 1

1。2。1 短路过渡