The effect of the corner treatment of the sheet metal welding bottom box on the structural strength is first reflected in the stress distribution. When the right-angle corner is subjected to force, stress concentration areas are easily formed at the corners, just like a vortex formed when a water flow encounters a right-angle turn. The transmission of force at the right angle will be blocked, resulting in a local stress value far exceeding that of other parts. The rounded corner treatment can evenly disperse the force along the curved surface, making the stress distribution smoother. Experimental data show that a rounded corner with a radius of 3-5mm can reduce the corner stress concentration factor by 40%-60%. This optimization is particularly important when the sheet metal welding bottom box is subjected to heavy pressure or impact. It can avoid cracking caused by excessive local stress and extend the service life of the sheet metal welding bottom box.
The folding treatment directly improves the deformation resistance of the sheet metal welding bottom box by increasing the thickness and rigidity of the corners. The folded edge formed by bending the edge of the sheet metal inward or outward is equivalent to adding a "reinforcement rib" at the corner, which increases the section modulus of the originally thin edge. For example, after a 1.5mm thick steel plate is folded at 90 degrees, the bending strength of its corners can be increased by 2-3 times, which can better resist deformation caused by external impact or extrusion during the transportation or installation of the sheet metal welding bottom box. At the same time, the welded joint between the folded edge and the sheet metal welding bottom box body forms a closed structure, which reduces the warping caused by thermal stress after welding and makes the structure of the entire sheet metal welding bottom box more stable.
From the perspective of safety, rounded corners can effectively reduce the risk of scratches during operation. Untreated right-angled corners are as sharp as knives. When installing internal components or performing daily maintenance, the operator's hands or clothes are easily cut, especially in the scene where the sheet metal welding bottom box needs to be opened and closed frequently, this safety hazard is more prominent. The smooth transition of the rounded edge can disperse the pressure during contact, and even if an accidental collision occurs, it can reduce the damage to the human body. In industrial safety standards, the corner radius of the equipment housing is usually required to be no less than 2mm, just to ensure the personal safety of the operator.
The improvement of welding quality by folding treatment indirectly enhances the safety of use. The welding contact area between the folded corners and the adjacent plates is larger, and the length and strength of the weld are increased accordingly, reducing the probability of false welding and leaking welding. For example, at the corner joints of the sheet metal welding bottom box, the folding treatment can change the weld from a straight line to an L shape, the contact area is expanded by more than 1 times, and the sealing after welding is significantly improved. This is crucial in scenes that require waterproofing and dustproofing, and can prevent water vapor or dust from entering the sheet metal welding bottom box through the weld gap, damaging electronic components or causing circuit failure.
Different corner treatment methods have a significant impact on the fatigue resistance of the sheet metal welding bottom box. In a right-angle corner under repeated stress or vibration environment, fatigue cracks are prone to occur in the stress concentration area, and the cracks will gradually expand from the corners to the inside, eventually leading to structural failure. The combined treatment of rounded corners and folded edges can delay the generation and expansion of fatigue cracks by dispersing stress and enhancing rigidity. In the simulated vibration test, the fatigue life of the sheet metal welding bottom box with rounded corners and folded edges is 3-5 times that of the sheet metal welding bottom box with right-angled corners. It is especially suitable for sheet metal welding bottom boxes installed on mechanical equipment or vehicles and can adapt to long-term vibration working environments.
Corner treatment will also affect the assembly safety of the sheet metal welding bottom box and other components. When the right-angle corners are matched with accessories such as sealing strips and mounting brackets, the accessories are easily worn due to sharp edges. For example, the rubber sealing strip will break and lose its sealing effect after long-term friction with the right angle. The rounded corner treatment can reduce the friction coefficient between the accessories and the corners, and the flat surface formed by the folding edge is convenient for the positioning and fixing of the accessories, reducing the risk of misalignment during assembly. On the sheet metal welding bottom box that needs to be disassembled frequently, this optimization can reduce the safety hazards caused by assembly errors and ensure that all components are always in the correct matching state.
The impact of corner treatment in special environments on safety is more critical. In a humid or corrosive environment, the closed structure formed by the folding edge can reduce the retention of moisture and corrosive media in the corners and reduce the rust rate. The gaps at right angles are prone to liquid accumulation, forming "dead corners" for electrochemical corrosion, which causes the corners to rust and perforate first. In addition, in explosion-proof scenarios, rounded corners can prevent static electricity from accumulating at right angles, and the smooth surface of the folded edges also reduces the possibility of sparks. These details together constitute the safety line of the sheet metal welding bottom box in special environments, ensuring its stable operation in complex working conditions.
