Final answer:
GMA welding does not consistently achieve 100% penetration, making the statement false.
Step-by-step explanation:
The statement is False. GMA (Gas Metal Arc) welding, also known as MIG (Metal Inert Gas) welding, uses a consumable electrode and a shielding gas to protect the weld from atmospheric contamination. While GMA welding can provide good penetration, it does not consistently achieve 100% penetration.
The heat produced during GMA welding can be controlled to some extent, but other factors such as weld joint design, welding parameters, and operator skill also play a role in achieving adequate penetration.