1. When the thickness of the connecting body is very large and the bolt length is very long, stud bolts will be used.：The purpose of anti-loosening of stud bolt connection: In actual work, the external load has vibration, change, high temperature creep of the material, etc., which will reduce the friction. The positive pressure in the thread pair disappears at a certain moment and the friction is zero, thus making the thread connection Loose, if repeated action, the threaded connection will loosen and fail. Therefore, it is necessary to prevent loosening, otherwise it will affect normal work and cause accidents.
2. When the main body is a large-scale equipment, it needs to install accessories, such as sight glass, mechanical seal seat, reduction frame, etc. The stud bolts used at this time, one end is screwed into the main body, and the other end is fitted with a nut after the accessories are installed. , Because the accessories are often disassembled, when the main body and the accessories are directly connected by bolts, the main body threads will wear out or be damaged over time, and it is very convenient to use stud bolts to replace.
3. Used to connect thick plates and places where it is inconvenient to use hexagonal bolts, such as: concrete roof truss, roof beam suspension monorail beam suspension, etc.
Double-headed screws need to be prevented from loosening. In actual work, external loads such as vibration, change, and high-temperature creep of the material will cause the friction to be reduced. The positive pressure in the thread pair disappears at a certain moment and the friction is zero, which makes the thread connection loose. After repeated action, the threaded connection will relax and fail. Therefore, it is necessary to prevent loosening, otherwise it will affect normal work and cause accidents.
Stud bolts save time and cost. The structure of all stud bolts does not require the steps of drilling, punching, threading, riveting, screwing and finishing, and continuously expands the application potential of structural design, high current and small penetration . Therefore, it can be welded to very thin plates. The workpiece for stud welding must be welded from one side. It can be welded in all positions, and can be restricted by means of an expander on a vertical partition. Because it is welded for a short time and there is little deformation after welding, no trimming is required. Because the welded structure does not require drilling, it will not cause leakage. The joint can reach high strength, that is, the joint strength of stud welding is greater than the strength of the stud itself.
Stud bolts are economical. The advantage of other welding methods lies in the welding power. For mass-produced workpieces, standard studs are low-cost. There are various types of equipment and welding guns, and the purchase cost of equipment is relatively low. According to the product, it can be made into a multi-station automatic welding machine, or a high-precision gantry CNC automatic welding machine. Stud welding has a higher quality reproduction rate and a lower rejection rate. However, in the application of stud welding, it is necessary to pay attention to other fusion welding, which has a certain limit on the carbon content in steel. For structural steel studs, weld according to the weldability of the recommended stud material and base metal combination, otherwise the stud There will be infusibility between the column and the base metal. The combination of stud materials and base materials outside the recommended range shall be tested to determine the weldability and the product design requirements of anchor bolts for relevant inspection and evaluation possibilities.
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