How Lead Pipes Are Welded

Lead piping is typically made by rolling lead sheets or casting it in a solid form. Lead has a low melting point of 327°C and a density of 11.34 kg/m³. The equipment used for lead welding is generally similar to that used for gas welding. Horizontal lead pipe welding can be done using either a rotating pipe end socket weld or a through-hole joint.
Pipe Rotating Butt Welding Joints: Generally suitable for shorter, rotatable pipes. Before welding, align the welding ends of the two short pipes, knock the joint flat with a wooden board, ensuring no misalignment at the joint, and then secure it with a locating weld. During the welding process, the lead pipe remains in a horizontal position and continuously rotates at a certain welding speed, welding in the direction of the flat butt welding operation. For joints with pipe wall thickness less than 4mm, weld a single seam; for joints with wall thickness greater than 4mm, process a bevel and perform multi-layer welding, with the covering layer elevated 2-3mm above the pipe surface.
2. Bored Fitting: Used for welding on long pipes that cannot be disassembled or are not easily rotated, first cut a piece off the top of each lead pipe to form a square opening, then weld the lower half-circle inside the pipe, and after passing the inspection, align the top cover plate and perform the welding.