The most common methods for securing a screw to a steel frame are using nuts, welding, or expansion bolts. The specific choice depends on the steel frame material and the intended use.
After understanding the requirements, the process can be divided into three steps: selecting the securing method, preparing tools, and optimizing installation details. Here are the specific methods:
1. Nut Fixing (Suitable for Detachable Scenarios)
If the steel frame has pre-drilled screw holes, simply insert the screw into the hole and tighten it with the matching nut from the other end. If the screw holes are not machined, you need to drill holes in the steel frame with a matching drill bit before inserting the screw. Suitable for equipment that requires regular disassembly and maintenance, such as shelves or machinery supports.
2. Welding Fixing (Permanent Reinforcement)
Weld the bottom of the screw to the contact surface with the steel frame using an electric welding machine. The weld point must completely cover the screw base. After completion, grind away the weld slag to ensure a smooth connection. Suitable for scenarios with high load-bearing requirements, such as steel structure bridges or heavy machinery bases. Note that welding will damage the steel frame's plating; for outdoor use, it is necessary to apply anti-rust paint.
3. Expansion Bolt Fixing (Wall/Concrete Composite Structure) For hollow iron frames or structures integrated with walls, first drill holes at the installation point using an impact drill, insert expansion bolt sleeves, and tighten the bolts. The sleeves then expand to achieve anchoring. This method is commonly used in scenarios requiring tensile strength, such as billboards and fence posts.
