1、 Introduction to Bridge Welding Specification Requirements
The specification requirements for bridge welding mainly include the following aspects: selection and quality requirements of welding materials, selection and implementation of welding processes, detection and evaluation of welding defects, appearance quality and dimensional accuracy of welded joints, strength and corrosion resistance of welded joints, etc. Corresponding specifications and standards need to be developed and implemented based on specific circumstances and requirements.
Suitable welding materials can be selected based on factors such as the material of the bridge, usage environment, and welding requirements. Commonly used technologies include electric arc welding, gas shielded welding, and laser welding. At the same time, it is also necessary to consider the control of welding process parameters and quality inspection.
For the detection and evaluation of bridge welding defects, non-destructive testing techniques such as X-ray testing, ultrasonic testing, eddy current testing, etc. can generally be used to detect and evaluate the presence of cracks, pores, and other defects in the welding area.
According to the different materials, processes, and design requirements used, the requirements for the appearance quality and dimensional accuracy of bridge welding joints will also vary, and specific analysis is required.
2、 What are the standards for outdoor cable trays
Outdoor cable trays can carry large power and communication lines, and have characteristics such as corrosion resistance, shock resistance, and wind resistance. At the same time, it can also adapt to various environments, such as rivers, highways, railways, etc., and has the advantage of strong flexibility.
The specifications of the outdoor bridge reflect the size of the bridge, which is related to the number of cables and cables to be laid, the filling rate specified in the bridge standard, and also determines the thickness of the board of the bridge. The surface of galvanized sheet bridge frames should not have white rust or other dirt, and foreign standards are not very clear about the specific appearance defects. If there are requirements for appearance in specific projects, they should be clearly listed in the contract.
After so many years of development in the cable tray industry, people have developed cable tray demand specifications, and the National Electrical Commission has even defined many versions of cable tray industry standards. If the bridge plate is galvanized, the zinc layer thickness on the surface of the plate should not exceed the thickness specified in the bridge standard, and there should be no scratches or scratches, and the surface should not have any stains.