Pipeline liquid phase diffusion welding clamping centering device

The invention discloses a pipeline liquid phase diffusion welding clamping centering device which comprises a sliding mechanism. The two ends of the sliding mechanism are provided with a fixed clamping mechanism and a sliding clamping mechanism respectively. A welding device is arranged in the middle portion of the sliding mechanism. An ejecting mechanism and an auxiliary ejecting mechanism are connected between the fixed clamping mechanism and the sliding clamping mechanism. Each clamping mechanism comprises a V-shaped support and a semi-opening type valve. A hydraulic cylinder and clamping jaws are arranged on the top wall of the semi-opening type valve. The auxiliary ejecting mechanism comprises a spring, a pressurizing disc and a connecting rod. Scale marks are engraved in the connecting rod. The pipeline liquid phase diffusion welding clamping centering device is efficient, saves energy, and is high in centering precision, capable of achieving smooth transition when misalignment exists and lowering stress concentration, not sensitive to misalignment effects and applicable to large oil and gas pipelines.