Simplify the following text for a Grade 9 native English-speaking person.
Original: Other solid-state welding processes include friction welding ( including friction stir welding ) , electromagnetic pulse welding , co-extrusion welding , cold welding , diffusion welding , exothermic welding , high frequency welding , hot pressure welding , induction welding , and roll welding .
Simplified: There are many kinds of welding , including arc welding , resistance welding , and gas welding .