Don’t push the rod along the weld, as doing so could strap slag in the weld pool, contaminating the weld. STEP 4: Maintain even distance and speed. To get a good weld, you’ll also want to ...

After a bit of cleaning the slag off, a solid, durable weld is left behind. The official name for this process is ‘exothermic welding‘, and it has been in use since the 19th century.