Analysis of the submerged arc in comparison between a pulsed and non-pulsed process
Analysis of the submerged arc in comparison between a pulsed and non-pulsed process
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脉冲与非脉冲工艺比较埋弧分析
DOI：
10.1007/s40194-016-0336-6
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发表时间：
2016
影响因子：
2.1
通讯作者：
K. Willms
中科院分区：
文献类型：
--
作者：
U. Reisgen;J. Schäfer;K. Willms
埋弧焊工艺具有几个优点，例如，高沉积速率和高表面质量。由于电弧是在焊剂覆盖层和熔渣下形成的焊接空腔中燃烧的，因此熔滴的脱离和空腔中的电弧行为并不十分清楚。因此，脉冲和非脉冲埋弧焊（SAW）过程的影响下的条件进行了观察和相互比较。通过使用基于高速技术和腔压力测量的实验装置和不同技术，可以观察到脉冲和非脉冲过程之间腔尺寸的预期变化。结果可以通过以20，000 fps的帧速率拍摄的高速视频来检测，这些视频通过玻璃窗格和陶瓷管进行拍摄，玻璃窗格在一侧暴露腔体，陶瓷管在焊接方向或垂直于焊接方向的短时间内与腔体连接。此外，空腔的压力测量提供了通过使用脉冲过程改变空腔尺寸的证据。视频的分析显示自由液滴脱离，而液滴与腔壁没有任何接触。焊接使用高强度细晶粒结构钢进行，其重要性不断增加，因此经常用于当前的建筑应用中。SAW工艺具有经济优势，但存在氢扩散的风险。因此，了解腔的尺寸和液滴的条件是非常有意义的。
The submerged-arc welding process has several advantages, e.g., a high deposition rate and a high surface quality. Due to the fact that the arc is burning in a weld cavity, which is formed under a flux blanket and slag, the droplet detachment and the arc behavior in the cavity are not quite clear. Therefore, the conditions under the influence of a pulsed and non-pulsed submerged-arc welding (SAW) process are observed and compared with one another. By using experimental setups and different techniques based on high-speed technology and pressure measurements of the cavity, an intended changing of the cavity size between a pulsed and non-pulsed process can be observed. The results can be detected by high-speed videos taken with a frame rate of 20,000 fps through glass panes, which expose the cavity on one side and through ceramic tubes, which make a connection with the cavity either in welding direction or perpendicular to the welding direction for a short time. Additionally, pressure measurements of the cavity give evidence of a changing size in the cavity by using a pulsed process. Analysis of the videos shows a free droplet detachment without any contact of the droplet with the cavity wall. The welds are carried out using high-strength fine-grained structural steels, which are continuously gaining in importance and therefore are often used in current construction applications. The SAW process has economical advantages, however, with a risk of hydrogen diffusion. Therefore, the knowledge of the cavity size and the droplet conditions are of great interest.