Welding of stainless steel pipes for mechanical structures (GB/T12700-1991)
Stainless steel pipes are commonly used for a wide range of mechanical structures, regardless of the application. There are many different types of stainless steel pipes, and each type has different physical and chemical properties that affect the weldability and suitability of each individual material for a particular purpose. As a result, it is important to understand the various grades and types of stainless steel pipes that are available and to select the appropriate one for each application.
To ensure the integrity of welded joints, proper welding techniques must be used. The most common welding procedures for stainless steel pipes are gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW). The welding parameters for GTAW and SMAW will depend on the grade and type of stainless steel pipe being used. In general, welding parameters for GTAW stainless steel pipes include a welding current of up to 500 amps and a welding speed of up to 10-15 cm/min. For SMAW stainless steel pipes, welding parameters include a current of up to 400 amps and a welding speed of up to 30 cm/min.
In addition to the welding parameters, it is also important to select the correct welding consumables to be used with the welding process. For stainless steel pipes, it is common to use a combination of stainless steel electrodes and a flux-cored wire. The type of stainless steel electrode to use will depend on the grade and type of stainless steel pipe being welded. In general, austenitic stainless steel electrodes are preferred as they provide good weldability and corrosion resistance. The flux-cored wire should be selected based on the grade and type of stainless steel pipe being welded and the welding process being used.
A comprehensive weld joint preparation and post-weld cleaning procedure is essential for the successful welding of stainless steel pipes. As stainless steel is a highly reactive material and can be easily damaged by contaminants in the environment, proper weld joint preparation is essential to ensure a good weld joint. Weld joint preparation includes cleaning, grinding and peening of the weld area. After welding is completed, post-weld cleaning is also recommended. This includes an acid pickling process as well as a passivation process to protect the weld joint.
The welding of stainless steel pipes (GB/T12700-1991) requires a skilled welder, who can properly select and use the correct welding parameters and consumables, as well as correctly prepare the weld joint and perform post-weld cleaning. Proper welding of stainless steel pipes is essential to ensure a strong weld joint and to protect the material from corrosion. In addition, it is important to follow all safety procedures when welding in order to protect the welder and any bystanders from potential hazards.
