the organization is more refined

Q235 steel substrate on the deposited metal and hardness analysis


Is to do a normalizing processing, the organization is more refined, hard carbide phase distribution is more uniform weld hardness increase, while the third layer in the welding surface due to the impact of non-normalizing, so the microscope hardness value is slightly lower. 3 Conclusions (1) arc welding electrode of the first layer of deposited metal by the base metal dilution effects of larger, less affected by the second layer,ed hardy uk, third layer largely unaffected, reflecting surfacing electrode deposition the performance of the metal itself. (2) the metal cladding layer microstructure and microhardness of the weld line with the input size of the energy: the energy-hour welding line,franklin and marshall, the distribution of martensite and the number of mostly small flakes; welding line energy is large, Markov mostly needle-like body, and with the welding heat input increases, the martensite content will also increase, increase the hardness of the metal cladding layer. (3) surfacing electrode alloying elements Cr,ouverture abercrombie paris, Mo, V reduces the martensite start temperature (Ms),franklin marshall milano, is conducive to the formation of martensite. (4) The hardness of the metal cladding layer on the whole more than 600HV, the second layer of deposited metal of the highest hardness values. References: [l] Welding Engineering Society of China. Welding Manual (l volume) eleven welding methods and equipment (2nd edition) [M]. Beijing: Mechanical Industry Press,ed hardy rea, 2001. [2] Welding Engineering Society of China. Welding Manual (Volume 2) The One and welding materials (2nd edition) [M]. Beijing: Mechanical Industry Press, 2001. [3] Liya Jiang, ZOU, Wuhui Jiang,tory burch uk, et al. HQ130 steel heat affected zone ICHAZ zone of performance [J1. Welding Journal, 2001,22 (2) :54-58. [4] Adams re away. Weld microstructure map [M]. Beijing: Mechanical Industry Press, 1985. [5] Jiang Xishan. [Map of special steel microstructure. Beijing: Mechanical Industry Press, 2003. [6] Lvde Lin, Li Yan Zhu. Weld metallographic analysis [M]. Beijing: Mechanical Industry Press, 1987 [7] Zhou Zhenfeng. Welding Metallurgy [M]. Beijing: Mechanical Industry Press, 1996. Single-phase welding of austenitic stainless steel to prevent hot cracking when the single-phase austenitic stainless steel such as hot cracking during welding 0Cr25Ni20 tendency is much greater than 1Cr18Ni9Ti stainless steel, especially in the root weld and crater backing of the most easy to produce hot cracking. But can not rely on such a small amount of steel of ferrite to improve crack resistance. Formed in the weld due to the ferrite, is bound to join a large number of ferrite forming elements, which makes the weld than the base material composition and performance that much difference, so can not meet the joint requirements. In addition, more ferrite will make joint embrittlement. (1) an appropriate increase in carbon content, the weld in a certain amount of carbide,ralph lauren polo, the composition and austenitic phase organization. Generally accepted that carbon is the main element of the crack caused by heat,ralph lauren skjorter, especially in the 18-8 steel welds, when the carbon mass fraction from 0.06% to 0.08% to 0.12% -0.14% of , a significant increase in hot cracking tendency; if and when the mass fraction of the carbon to continue to increase to 0.18% to 0.20%, the hot tearing tendency is even greater. So for 18-8 stainless steel, always strive to reduce the carbon content of the weld to ensure adequate anti-cracking performance. But in the single-phase austenitic stainless steel, due to higher than carbon, has been high enough to cause the extent of thermal cracking, to limit its content has been impossible. Then if we increase the carbon content of the weld to keep the right amount of carbide eutectic, eutectic material such as low melting point, good fluidity, the pool was dispersed in the crystallization process can be refined Albright body of grains, and contraction occurs in the metal bath and pulled off the thin layer between the crystalline moment in time to fill the gap between the crystal in order to enable the crack will not produce. Thermal cracking, for 25-20,15-36 type single-phase austenitic stainless steel and other species, can i like, 0Cr25Ni20Mo2 type electrode A412, there is the mass fraction of 2% -3% Mo. i For example, the welding-type 25-20 steel casting, if you use the same ingredients and base metal electrode,ed hardy tøj, or {to take other measures,fitch abercrombie, can effectively prevent the crack. t. . + + +. . +++. +. . + +. . +·+··+Example (3) strict control of the weld metal in the S, P and other harmful impurities. wire, as long as the mass fraction of phosphorus in the weld does not exceed 0.015%, no longer taken

相关的主题文章：


A. Absolute value of the more consistent

△ t ​​= 2t. L /

drying 350 ℃ × 1h