The Basics of Stud Bolts

Manufactured in compliance with GB897-GB901 standards, stud bolts are made from various materials such as Q235, 45#, 40Cr, 35CrMoA, and Q345D. These bolts are available in a range of specifications from M3mm to M100mm, with the length customizable to meet user requirements. Known for their high strength, stud bolts are constructed using materials like 35#, 45#, 35CrMoA, 25Cr2MoV, 304, 316, 304L, 316L, 2H, 2HM, B7, B7M, B16, B8, 8, B8M, and 8M. They find extensive application in industries such as electric power, chemical, oil refining, valves, railways, bridges, steel structures, and automobile and motorcycle accessories. These bolts are commonly used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, pendant towers, long-span steel structures, and large buildings, among others.

Typically, stud bolts are represented as follows: M12×100 GB 901-88 (standard) 35#/35# (material) 8.8 grade/8 grade (modulation grade). This representation indicates that the bolt has a diameter of 12mm and a length of 100mm, complies with the GB 901-88 national standard (or industry standard), and is made from 35# material. The modulation grade can be 8.8 or 8.

Stud bolts are known for their time and cost-saving benefits. By eliminating the need for drilling, punching, riveting, and finishing, these bolts simplify the structural design process and allow for efficient installation. Welding thin sheets becomes possible, as stud bolts require welding from one side only. They can be welded in any position, aided by extenders on vertical bulkheads that provide restriction. With minimal deformation and no trimming required after welding, the joint achieves high strength and prevents leakage. The strength of the stud weld joint exceeds that of the stud itself.

Stud installation is an economical option, thanks to its welding power and low cost for standard studs used in mass-produced workpieces. There are several types of equipment and welding torches available, with relatively low acquisition costs. For specific products, it's possible to use a multi-station automatic welding machine or a high-precision gantry-type CNC automatic welding machine. Stud welding offers high quality reproducibility with a low rate of rejection. However, it's essential to note that stud welding, like other fusion welding methods, has specific carbon content restrictions in the steel. For structural steel studs, it's vital to follow the recommended combination of stud material and base metal while considering the infusibility of certain materials with the base metal. Combining stud material and base metal outside the recommended range should undergo testing to determine their weldability and the possibility of relevant inspection and evaluation based on the anchor bolt's product design requirements.