發送短信 : Metal powder addition in submerged arc welds

   _____    _____     _____     _____             
  / ___//  |  ___||  / ____||  |  ___||     ___   
  \___ \\  | ||__   / //---`'  | ||__      /   || 
  /    //  | ||__   \ \\___    | ||__     | [] || 
 /____//   |_____||  \_____||  |_____||    \__ || 
`-----`    `-----`    `----`   `-----`      -|_|| 
                                             `-`