Pipe welding layout and preparation tools help ensure accurate and repeatable welds. Pipe marking tools scribe lines and indicate the center of a pipe to ensure accurate cuts. Pipe measuring tools wrap around pipes to measure the circumference and have integrated scales for marking angles. Pipe welding clamps securely hold two pipes in position so they can be fit for welding. Socket weld spacer rings fit in a socket joint to create the minimum gap required for welding. Pipe purging equipment seal pipes to create a chamber to introduce noble gas, which creates an atmosphere for a high-quality weld.