Hello, according to the questions you asked, give the following answers. If you repair the trunk, you need a special aluminum welder. Our usual welding machine meson machine can't operate. If you operate, you can do it one by one The equipment specially designed for welding aluminum is actually the same as the meson machine. The function is different. This kind of machine is generally available in repair shops or 4s shops that maintain luxury car brands. Of course, the cost of repair is also quite high. If only you could knock it with a hammer when you remove it from the inside. If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.