|关键词: 焊接材料 9%Ni钢 选用原则 工程应用
|Discussion on selection principle of 9% Ni steel welding consumable based on engineering application
|The selection principle of 9% Ni steel welding consumables in engineering application was discussed. The results show that the weld metal was different from the base metal when the selected consumables were used under engineering conditions. The toughness of the joint can reach the equal toughness matching level and ratio of the strength to toughness of the joint is much higher than that of the base metal. The selection of high quality, suitable welding consumables and reasonable welding process is an important technical means to control and improve the weldability of the steel. The so-called equal toughness matching principle of the 9% Ni steel dissimilar weld is to achieve the nickel based austenite microstructure and thus ensure the best mechanical properties (including low temperature toughness) and weldability of the joint by scientifically and reasonably control the chemical compositions of the weld. Five kinds of the welding consumables have been developed and the test results indicated that comprehensive properties of the typical welding consumables have obvious advantages.
|Key words: welding consumable 9% Ni steel selection principle engineering application