 Many welding processes require the use of a particular joint design ; for example , resistance spot welding , laser beam welding , and electron beam welding are most frequently performed on lap joints . Other welding methods , like shielded metal arc welding , are extremely versatile and can weld virtually any type of joint . Some processes can also be used to make multipass welds , in which one weld is allowed to cool , and then another weld is performed on top of it . This allows for the welding of thick sections arranged in a single @-@ V preparation joint , for example . 
