1. Wear a square piece of wood in the inner cavity, which should be filled tightly, and then shape the bent aluminum square pipe, so that it can be straightened and protected. The outer surface wrinkles can be welded and polished, and pretreatment such as scraping ash is needed if spraying;

2. If the bend is serious, you can try to start cutting from the bend, reshape and fill the port, and then weld. In order to reduce or avoid the scrap of aluminum alloy due to bending, we should pay attention to three aspects: extrusion straightening, extrusion framing and surface treatment. Extrusion straightening is a very serious link that leads to the bending of aluminum profiles. When straightening, you must pay attention to the strength of straightening. If the strength is too large, it may cause deformation, necking, orange peel and so on. Profile. If the force is too small, the profile will be straightened and bent. Extrusion framing is to fix the length of the sawn framing. It is necessary to find out whether it is big or small, whether it is a material with a tube or a material drawn by a plane die. It is not easy to support both ends of large materials and pipes, and it is easy to bend small materials and materials pulled by plane dies when they are hung at both ends. At this time, they should be hung from both ends to the middle and framed. There is a big gap in the deformation and bending of the bottom profile of the broken bridge aluminum window, so steel, aluminum flat steel or U-shaped steel and aluminum can only be added to narrow the gap. Or make an l-shaped edge seam.