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

JIS G3106—1999 Carbon Equivalence and Welding Crack Sensitivity Combination

The JIS G3106—1999 standard is a guidance document issued by the Japanese Industrial Standards (JIS) organization to standardize the welding methods used to construct and repairmechanical, electrical and electronic components. It also provides guidance on proper joint design and material selection for these components. This document presents an overview of the most important welding attributes addressed by JIS G3106—1999 and provides an understanding of how these attributes affect both weld quality and total product cost.

The main purpose of JIS G3106—1999 is to better ensure product safety and reliability by standardizing design and manufacturing methods in the welding industry. This document is divided into three main areas: Carbon Equivalence, Welding Crack Sensitivity, and Welding Environment.

Carbon Equivalence refers to the calculation of carbon equivalence in terms of the metallic content of the welded joint. Carbon Equivalence (CE), is a measure of the overall ability of a joint to resist oxidation. It is determined by assessing the metallic content and its impact on the resistance of oxidation. A CE value of no less than 4.5 must be achieved to ensure the optimum resistance to oxidation. The CE values used in JIS G3106—1999 must be present in the parent material and filler metal used.

Welding Crack Sensitivity is of great concern in the welding industry due to the potential of crack formation during and after the welding process. This crack formation can lead to reduced fatigue strength and ultimately weld failure, resulting in costly product returns or repair. JIS G3106—1999 outlines the guidelines for weld crack sensitivity. These guidelines provide a minimum required ratio of reference defect length to total weld length in order to pass acceptance criteria, as well as a maximum total length for the defect.

Lastly, Welding Environment refers to the environment in which welding systems are operated. JIS G3106—1999 outlines the necessary welding environment criteria to be met, includinghumidity and temperature levels. The document also specifies parameters for fumes, gases, and dust levels.

The JIS G3106—1999 standard is a comprehensive document intended to provide uniformity in the welding industry, ensuring safer products and more reliable welds. Adherence to the guidelines set forth in the JIS G3106—1999 welding standard helps prevent miscommunication between the manufacturer and customer, ultimately providing the customer with dependable, accurately specified welds.

JIS G3106 is a type of carbon equivalence and fracture-sensitive welding combination standard for steel material. This standard is applicable for building steel structures with welding and hot-rolled steel plates that are used for welding structures of pressure vessels and buildings.

The carbon equivalence(CE) and fracture-sensitive welding ability of steel material used in welding structures shall be clearly specified in accordance with JIS G3106. This standard defines the classification of steel material by carbon equivalence and fracture-sensitive welding ability, and classifies the type and strength grade of steel material according to its performance.

The core elements of the JIS G3106 standard are the control of carbon equivalence and the fracture-sensitive welding combination. Carbon Equivalence is a measure of how much carbon is in the steel. Generally speaking, JIS G3106 stipulates that for welder qualification conditions, CE should be considered. If a higher CE value is applied, HIC (Hydrogen Induced Crack), Sorit Erosion and welding fracture are likely to occur during welding.

HSLA steel materials should be used for fracture-sensitive welding. Generally speaking, the thickness of the steel plate and the preheating temperature under the welding conditions should be taken into account to ensure the necessary resistance to hydrogen-induced cracking and ensure a good quality weld.

In conclusion, JIS G3106 is an important standard used for welding structures of pressure vessels and buildings. The carbon equivalence and weldability of steel materials should be specified according to this standard as it provides guidance on the classification of steel materials, the appropriate type and strength grade and necessary precautions based on performance.