... outside anti-edge The welding method of pass in and out water tie-in : automatic argon-arc welding ... spot welding, then seam welding The welding method of inner container circular seam: first anti-edge, ... fold edge, then planish The support box of the vacuum tube bottom ,spot welding reinforce after ... request to make the special machine.Explanation:Payment : TT, 30% as deposit in advance, the balance 70% ...