Stud

Stud, also known as double-headed screws or studs. Used to connect the mechanical fixed link function, the stud bolts are threaded at both ends, and the middle screw is thick and thin. Generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, hanging towers, large-span steel structures and large buildings. Bolts refer to screws with larger diameters or heads, such as studs. In general, it is not called "stud bolt" but "double stud". The most common form of studs is threaded at both ends with a polished rod in the middle.

The main purpose:

The most typical use: anchor bolts, or similar anchor bolts, thicker connections, when common bolts are not possible.

1. For the main equipment, it is necessary to install accessories such as sight glass, mechanical seal seat and speed reduction frame. At this time, the stud bolt is used, one end is screwed into the main body, and the other end is attached with a nut. Since the attachment is frequently disassembled, the thread may be worn or damaged, and it is very convenient to replace the stud bolt.

2. For the thickness of the connecting body, when the bolt length is very long, the stud bolt will be used.

3, used to connect thick plates and inconvenient to use hexagonal bolts to connect, such as concrete roof trusses, roof beam suspension monorail beam suspension parts.

Anti-loose purpose:

In actual work, the external load has vibration, change, high temperature creep of the material, etc., which will reduce the friction force. The positive pressure in the thread pair disappears at a certain moment, and the friction force is zero, so that the thread connection is loose, such as repeated action, threaded connection It will relax and fail. Therefore, it is necessary to prevent loosening, otherwise it will affect normal work and cause accidents.

Basic knowledge:

The stud bolt is manufactured according to GB897-GB901 standard. The materials used are: Q235, 45#, 40Cr, 35CrMoA, Q345D. The specifications are: M3mm-M100mm, the length can be customized according to user needs.

High-strength stud bolts, made of 35#, 45#, 35CrMoA, 25Cr2MoV, 304, 316, 304L, 316L, 2H, 2HM, B7, B7M, B16, B8, 8, B8M, 8M, widely used in electric power, chemical industry , refining, valves, railways, bridges, steel structures, automobile and motorcycle parts, etc.

Stud bolt function: generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, hanging towers, large-span steel structures and large buildings.

Representation of studs: General studs are: M12×100 GB 901-88 (standard) 35#/35# (material) 8.8/8 (modulation level) means: diameter = 12mm length = 100mm GB 901-88 uses the national standard (of course, industry standards can also be used as needed)

Stud standard: GB 900-1988

Introduction to stud bolts Save time and cost All stud bolt constructions do not require drilling, punching, threading, riveting, threading and finishing, and continue to expand the application potential of structural design, high current and Small penetration. Therefore, it can be welded to a very thin plate. Stud-welded workpieces must be welded from one side. Can be welded in all positions, with the aid of the expander can be limited to the vertical partition. Since it is welded for a short time and is rarely deformed after welding, no trimming is required. Because the welded structure does not require drilling, it does not cause leakage. The joint can achieve very high strength, that is, the joint strength of the stud welding is greater than the strength of the stud itself.

How to install a stud with good economy The advantage of other welding methods lies in the welding power. For studded workpieces, standard studs are low cost. There are many types of equipment and welding torches, and equipment purchase costs are relatively low. According to the product, it can be made into a multi-station automatic welding machine or a high-precision gantry type CNC automatic welding machine. Stud welding has a high quality reproduction rate and a small scrap rate. However, stud welding should pay attention to other melting welding in the application. There is a certain limit on the carbon content in the steel. For structural steel studs, weldability is recommended according to the recommended combination of stud material and base metal. Otherwise, studs There will be infusibility with the parent metal. Stud materials and base metal combinations outside the recommended range are subject to testing to determine weldability and anchor bolt product design requirements for relevant inspection and evaluation possibilities.