That’s me under the hood, welding a rear triangle together. Most builders align their frames after the welding has distorted them, this is known as ‘cold setting’. To minimize internal stresses (and get frames as straight as possible) I purposely misalign each frame when tacking, and then use a very specific welding sequence to bring the frame naturally into alignment. The frame gets closer and closer to alignment as each weld is laid. When the last weld is completed the frame will be straight, no cold setting required.