Stud, also called double-head screw or stud. The fixed link function used to connect the machine. The stud bolt has threads at both ends, and the middle screw is thick or thin. Generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, crane towers, large-span steel structures and large buildings, etc. Bolts specifically refer to screws with larger diameters, and can also have no heads, such as stud bolts. Generally, it is not called a "stud bolt" but a "double stud". The most commonly used form of double-ended studs has threads at both ends and a polished rod in the middle. The most typical use: foundation bolts, or places similar to foundation bolts, thick connections, when ordinary bolts cannot be achieved.
- It is used in large-scale equipment that requires installation accessories, such as sight glasses, mechanical seal seats, and deceleration racks. At this time, stud bolts are used. One end is screwed into the main body. After the accessories are installed, the other end is put on a nut. Since the accessories are often removed, the threads will be worn or damaged. It is very convenient to use stud bolts to replace. 2. When the thickness of the connecting body is very large and the bolt length is very long, stud bolts will be used. 3. It is used to connect thick plates and places where it is inconvenient to use hexagon bolts, such as concrete roof truss, roof beam suspension monorail beam suspension, etc.
How to install stud bolts is economical. The advantage of other welding methods lies in the welding power. For mass-produced workpieces, standard studs are low-cost. There are many types of equipment and welding torches, 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 smaller rejection rate. However, in the application of stud welding, attention should be paid 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 base metal 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.
Stud bolts generally need to undergo surface treatment. There are many types of bolt surface treatments. Generally, electroplating, blackening, oxidation, phosphating, and non-electrolytic zinc flake coating are commonly used. However, electroplated fasteners occupies a large proportion in the actual use of fasteners. It is especially widely used in industries and fields such as automobiles, tractors, home appliances, instrumentation, aerospace and communications. However, for threaded fasteners, not only a certain anti-corrosion ability is required in use, but also the interchangeability of threads must be guaranteed, which can also be referred to as screwability here. In order to simultaneously meet the dual use performance of "anti-corrosion" and "interchangeability" required by threaded fasteners in use, it is very necessary to formulate special plating standards.
The GB/T5267.1-2002 [Threaded Fastener Electroplating Layer] standard is one of the national standards "Fastener Surface Treatment" series of standards, including: GB/T5267.1-2002 [Fastener Electroplating Layer]; GB/T5267.2-2002 [Non-electrolytic zinc flake coating for fasteners] Two standards. This standard is equivalent to adopting the international standard ISO4042;1999 [Electroplate of Threaded Fasteners]. This standard replaces the GB/T5267-1985 [Plating layer of threaded fasteners] standard.
During each maintenance, the newly replaced studs and other newly replaced accessories must be inspected. The focus of the inspection is on the head and guide part of the stud, and the thread must be strictly checked for each part. No cracks or dents, but also check the tooth shape of the stud to see if there is any change. Whether there is any abnormality in the pitch, if there is any abnormality, it must not be used again. The torque wrench should be used when installing the connecting rod cover. Must be tightened in accordance with the prescribed standards, the torque cannot be too large or too small, but also pay attention to choosing the stud bolts and studs of the supporting manufacturer.