Weldability Analysis of Stainless Steel Tube

Process weldability of stainless steel tube refers to the ability to obtain high quality, non-defective welded joints under certain welding conditions. For the welding, the welding process generally undergoes heat transfer and metallurgical reactions. Therefore, the process of welding is divided into "hot welding" and "metallurgical weldability." Thermal weldability refers to the degree of influence on the microstructure and performance of the weld heat affected zone under the condition of welding thermal process. It is to assess the sensitivity of the weld metal to heat, mainly with the welding material and welding process conditions. Metallurgical weldability refers to the degree of influence of metallurgical reactions on weld performance and defects. The weldability is to describe the adaptability of the material to the welding process. It refers to the difficulty of obtaining the high quality welded joint under certain welding methods, welding materials, process parameters and structure type, and whether the welded joint can be used under the conditions of use Reliable operation. The specific content of the weld can be divided into process weldability and the use of weldability.

The use of weldability refers to the degree to which the welded joints or the overall structure meet the various performance requirements specified in the technical conditions. Including conventional mechanical properties, low temperature toughness, brittle fracture resistance, high temperature creep, fatigue properties, lasting strength, and corrosion resistance, wear resistance and so on.

In the welding analysis of materials, the past is often limited to qualitative analysis, and now with the development of computer technology, welding workers carried out a lot of research work, the establishment of a variety of welding prediction mathematical model, such as: carbon equivalent Model, preheating temperature model, critical stress model, maximum hardness model, mechanical performance model These mathematical models are established to make the weldability analysis of new materials more accurate.

A mathematical model is a real-world model that is described in mathematical language. Mathematical model can quantitatively describe the internal relations and changes of things. The establishment of a mathematical model of a system is a qualitative leap in people's understanding of the matter. Mathematical models can be divided into static and dynamic categories. The static mathematical model is a factor that does not contain time when an entity is in equilibrium. The dynamic mathematical model describes changes over time due to physical activity.

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