Identify weldable and non-weldable substrates used in vehicle construction. KCTCS Courses included in HS .le: Lesson is prepared for course highlighted. ..The weldability, also known as joinability, of a material refers to its ability to be welded. Many metals and thermoplastics can be welded, but some are easier to .Metal identification tests that can be performed in any metal shop. Surface repair, or even to determine if the metal is weldable, you must be able to identify its underlying type. . Then create a list of names with the corresponding numbers..Check a car 's accident, owner, and .le history -- for free. generally speaking, only cast iron is not weldable, esp. pig irong, white iron, sometimes gray. depends on skill and Find out what the code means all car makes and carnds..