The current situation of international standard sy
Release Time：2020-12-21 丨 Editor：KAIROD BUSINESS 丨 Popularity：
As an effective means to lead the technical progress of the industry and promote the improvement of product quality, standardized t-work is increasingly attracting the attention of the government and industry. In recent years, significant changes have taken place in the international welding material standards. As the largest and most authoritative international standardization organization in the world, the international organization for Standardization (ISO) has successively completed a series of revision of welding material standards, forming a relatively complete standard system. European welding material standard (EN) is basically consistent with the a system of ISO welding material standard, and many standards directly refer to ISO standard. At present, the United States undertakes the function of ISO / tc44 / SC3 Secretariat and plays an important role in ISO t work. The B system of ISO welding material standard is based on American AWS standard. At present, Japan is actively integrating and transforming its own standards according to ISO welding material standards. Therefore, by understanding the current situation and development trend of the main international welding material standards, timely revising the welding material standards in China will have a far-reaching impact on the development of domestic welding materials.
Current situation of welding material standard system in the world
1.1 current situation of ISO welding material standard system
ISO / tc44 "Technical Committee on welding and related methods" is responsible for standardized t-work in the field of ISO welding. The Secretariat of ISO / tc44 is located in the French Institute of standards (AFNOR), with nine sub technical committees and three working groups. At present, the number of standards under the jurisdiction of ISO / tc44 is more than 270 [1]. For a long time, ISO welding material standard has been a weak link in the welding standard system, and it has not been widely used in the world. The fundamental reason is that there are technical differences in the classification of welding materials in different countries. At present, there are mainly two types of classification system in the international welding material standards. One is the system of European countries, which classifies the strength grade according to the yield strength, and has higher requirements on the impact absorption energy (at the corresponding temperature ≥ 47 J) In the stainless steel welding materials, the model is named according to the nominal composition; the second is the system of Pacific Rim countries (including the United States, Japan, China, etc.), which divide the strength grade according to the tensile strength, and have relatively low requirements for impact absorption energy (at the corresponding temperature ≥ 27 J), while in the stainless steel welding materials, the model is named according to the alloy type. It is precisely because of this difference that different countries have different opinions, which leads to the improvement of ISO welding material standard, t work has been stagnant [2].
In the 1990s, ISO / tc44 / SC3 revised is02560 welding materials - Classification of covered electrodes for arc welding of non alloy steel and fine grain steel. After repeated coordination, a consensus was reached in 2002, and is02560:2002 was issued. The standard adopts the mode of "coexistence" of a and B classification, that is, the same standard contains two different model systems of a and B. Model system a is consistent with the model system in European standards (EN), and model system B is similar to that in Asian and Pacific National Standards (such as AWS, GB, JIS, etc.). In the following years, ISO / tc44 / SC3 developed other standards for welding materials based on is02560:2002 standard. In addition to the general standards of non-ferrous welding materials and test methods, the existing ISO welding materials standards are based on a
