Flash Butt

 Recently I read an article in the paper about an accident involving a freight train and a mobile welding truck. Luckily no one was injured, but the part of the story I found most interesting was the description of the truck. Its seems this vehicle was performing some on the spot flash butt welding. That set my spanko senses a-tingling and I had to find out more.

Here's a description of the process. Read it carefully then tell me if you perceive any spanking references. (I did remove a few extraneous words here and there so it would sound less like welding and more like...you know.)

Flash Butt Welding

The surfaces of the pieces are positioned end-to-end. Preheating is carried out under low pressure. Once the joint is heated, flashing commences and joint surface material is burnt, resulting in even joint surface. Then upsetting commences, resulting in an irregular surface of the upset metal.