人妻中出无码一区二区三区,男女又黄又刺激a片免费,成人三级做爰视频在线看,国产精品99久久久久久人

Welcome to XX Bearing Technology Co., Ltd
CN|EN
Your location: Home -> Product display -> seam welder
  • Fully automatic roller welding machine
< >

Fully automatic roller welding machine

Roll welding machine is a machine used for roll welding. Roll welding, also known as circular seam welding, is a method of using a pair of roller electrodes instead of cylindrical electrodes for spot welding.

  • Fully automatic roller welding machine
Details


Product Introduction:

Roll welding machine is a machine used for roll welding. Roll welding, also known as circular seam welding, is a method of using a pair of roller electrodes instead of cylindrical electrodes for spot welding. The welded workpiece moves between the roller plates, creating a sealed weld seam with overlapping fusion nuclei to weld the workpiece together. Generally, AC pulse current or amplitude modulation current can be used, and three-phase (single phase) rectification, intermediate frequency, and high-frequency DC current can also be used. Roll welding is widely used in thin plate welding of sealed containers in oil drums, cans, radiator, aircraft and automobile fuel tanks, rockets and missiles. The general welding thickness is within 3mm of the single plate.
Main features:
The weld seam of roll welding consists of one welding point, which can be divided into roll spot welding or airtight seam welding according to different core melting overlaps. The formation process of each solder joint, like spot welding, involves three stages: pressurization, heating melting, and cooling crystallization, but there are significant differences from spot welding. Due to the inevitable phenomenon of shunt, the distribution of current and thermal fields in the welding area has its own characteristics; The rolling disc that transmits pressure and is heated by electricity continuously rotates to change the welding position, so that the distribution of current and heat fields, as well as the crystallization characteristics of the melting zone, are all related to the speed of changing the position.
99久久99这里只有免费费精品| 丰满少妇高潮惨叫久久久| 黑人30厘米全部进去了| 蜜臀久久精品久久久久酒店| 在线亚洲人成电影网站色www| 午夜福利麻豆国产精品| 老妇bbw搡bbbb搡bbbb| 几个东北熟妇的性经历| 钙片gay男男gv在线观看| 强壮的公次次弄得我高潮a片日本 高h短篇辣肉各种姿势自慰h | 精品无码人妻一区二区免费av| 欧美大屁股喷潮水xxxx| 免费av欧美国产在钱| 久久亚洲精品成人av无码网站| 国产伦精品一区二区三区免费迷| 无码网站| 吉林小伟无套gay| 中文字幕在线精品视频入口一区| 最近中文版字幕2019日本| 色欲av亚洲情无码av蜜桃| 欧卅无码a片少妇人妻久久尤物| 日本无人区码卡二卡三卡| 国产性一交一乱一伦一色一情| 免费看少妇高潮成人片| 少妇做爰特黄A片免费看9588| 无码熟妇人妻AV在线影院| 小秘书夹得真紧好爽h调视频 | 曰本性l交片免费看| 福利cosplayh裸体の福利| 欧洲精品99毛片免费高清观看| 久久99热狠狠色av蜜臀| 和朋友换娶妻a2020| 国产精品久久久久无码av| 精品少妇ay一区二区三区| 无码熟妇人妻AV在线影片免费 | 军人边走边吮她的花蒂| 视频播放器大全高清视频| 精品欧洲av无码一区二区三区| 日韩精品一区| 亚洲人成亚洲人成在线观看| 久久久久成人精品免费播放动漫|