Mechanical Properties of JIS G3106-1999 Combination of Carbon Equivalent and Welding Crack Sensitivity

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JIS G3106 is a Japanese material standard for hot rolled steel for welded structure steel plates, sheets, strips for Architecture, Engineering Structures. This hot-rolled steel material is suitable for structural steel with hot-rolled steel plates, sheets, and strips. The material is featured with higher yield strength, tensile strength and fracture toughness in low temperature and atmospheric environment.

JIS G3106 addresses the mechanical properties of both carbon equivalent and weldability properties that are necessary for the application of the structural steel. The carbon equivalent is the ratio of the carbon content plus the equivalent of other alloying elements present in the steel. The weldability of the material is determined by its weldability index, which is calculated using the recipe formulated in the specification. The recipe contains many combinations of carbon equivalent, total alloying elements, and tensile strength of the steel.

JIS G3106 also discusses the relationship between the mechanical properties of welded structures and the temperature and humidity of their environment. It specifies the maximum allowable values for the mechanical properties of welded structures when they are exposed to different temperature and humidity conditions.

Some of the mechanical properties that are specified in JIS G3106 are yield strength, tensile strength, elongation and brittleness, impact strength, and hardness. In addition, it also specifies the maximum amount of deformation or strain allowable in a given temperature and humidity conditions.

The materials specified by JIS G3106 are mainly used for building structures and ships, bridges, container and other structural parts and components. The material is also suitable for wear resistant parts, steel columns and support components.

In conclusion, JIS G3106 is an important Japanese material standard for hot rolled steel for welded structure plates, sheets, strips with the specification of mechanical properties including the response of the carbon equivalent and the weldability properties. It not only helps to determine the mechanical characteristics of welded structures when exposed to different environmental conditions, but also provides the necessary guidelines for designing structures with the appropriate properties.

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JIS G3106 provides some requirements for carbon equivalent and fracture sensitivity combination of mechanical properties for welded structure. The basic concepts of carbon equivalent and fracture sensitivity are introduced.

Carbon equivalent (CE) is used to calculate the standard of preheating and postweld heat treatment of welded structures, and it is also the basis of determining the preheating temperature of welding. The carbon equivalent of weld metal can be calculated according to the chemical composition of welded joint. The carbon equivalent of the weld metal is higher than that of the base metal.

Crack sensitivity is caused by the stress concentration of the crack. The sensitivity of structure to crack initiation and crack propagation brought by the welding process is related to the yield strength, welding residual stress and welding line orientation. The fracture sensitivity of welded structures can be determined through a combination of mechanical properties such as yield strength and tensile strength. G3106 specifies that the mechanical properties of the welded structure should meet the minimum requirements of high strength after welding and should have high crack sensitivity.

G3106-1999 requires that the mechanical properties and carbon equivalent of the welded structure should meet certain specific requirements. It is an important basis for the design of the welded structure and provides an effective means for the determination of the quality of the welded structure. It can ensure the safety of the structure and the reliability of the welding quality.