國產精品午夜在線播放a_色综合视频网站_中文字幕人妻第二区_亚洲成人的天堂av_三级久久综合日本_别揉我奶头~嗯~啊~视频_日本高清中文字幕在线dv_秋霞影院亚洲wm_午夜91大神在线播放_污污网站免费观看

The Yttrium-Tungsten Electrode produces a slim arc when used in welding. Tip color of tungsten yttrium electrodes is blue. Another point is that the yttrium content, in tungsten yttrium electrodes, content of yttrium ranges from 1.8% to 2.2%.  With a high level of compression, it has a bigger melting depth in medium and high current.