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众所周知,用交流钨极氩弧焊焊接铝、镁及其合金时,由于电极的几何尺寸和发射电子的能力不同,会出现所谓直流分量的问题。直流分量的存在,对焊接质量、焊接设备都极不利。它使去除工件表面氧化膜的工作增加困难,使熔深和熔宽沿焊缝不一致,恶化了焊缝成型;还使电源变压器一次线圈的激磁电流增加,损耗增大,严重时还会烧毁变压器。因此,人们都想出各种各样的办法来减少或完全消除直流分量。但是,在一定的条件下,对于一定的焊接电流,直流分量究竟有多少呢?对此不少人是不清楚的。
As we all know, with the exchange of TIG welding aluminum, magnesium and its alloys, due to the electrode geometry and the ability to emit electrons will appear the so-called DC component problems. The presence of DC components, the quality of welding, welding equipment are extremely negative. It makes the work of removing the oxide film on the workpiece more difficult, so that the penetration depth and melting width along the weld is inconsistent, which deteriorates the weld formation; also makes the power transformer primary coil excitation current increases, loss increases, in severe cases will burn the transformer . Therefore, people come up with a variety of ways to reduce or completely eliminate the DC component. However, under certain conditions, for a certain amount of welding current, what is the DC component? To this a lot of people are not clear.