What is the device used to hold a pipe flange onto a pipe for welding called?

The device specifically designed to secure a pipe flange onto a pipe during the welding process is known as a flange welding clamp. This specialized tool ensures that the flange maintains proper alignment and stability while welding, which is crucial for achieving a high-quality joint that can withstand pressure and stress. By providing a firm grip, the flange welding clamp also helps prevent any movement that could result in misalignment or flaws in the weld.

Unlike a general welding clamp, which might not be tailored specifically for flanges and may not provide the necessary support for this type of joint, the flange welding clamp offers features that are optimized for holding flanges securely. This includes the ability to accommodate the unique shape and dimensions of flanges, which can vary significantly in size and configuration. Other options, such as a pipe holder or flange adapter, do not serve the same specific purpose in this context, making the flange welding clamp the correct choice for this application.