Solder joints have an outstanding advantage is the tightness is guaranteed, however, dug trench must be large enough to carry out welding. At the point or points internally, we often diverted apply solder joints. At the point where the two connectors have fixed the middle we must proceed with solder connection. When it needs to accurately measure the distance between the ends of the tube, can be a head still proceed Flanged or bowl and the other end will connect welding. Cut exactly to the distance between the ends of the tube, can be a head still proceed Flanged or bowl and the other end will connect welding. Cut exactly the distance was measured, then the sign of our top tube and open a door at the head of welding, this door is opened by cutting or welding rods used to blow off. When solder connectors will face in the tube by introducing the welding rod through the door and welding, after welding is completed, you welded the door, and so the tube will be closed
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