Welding flux matched with nickel-base welding strip with high Mn and high Nb crack-resistant defects, and welding method
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An anti-crack and flux technology, applied in the direction of welding equipment, welding medium, welding equipment, etc., can solve the problems of immaturity, cracks, crack sensitivity, etc., and achieve the effect of no undercut, low impurity content, and reduction of harmful impurities
Inactive Publication Date: 2020-01-03
HARBIN WELL WELDING CO LTD +1
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Problems solved by technology
According to the requirements of nuclear power technology and corrosive media, its material has gradually developed from INCONEL 600 to INCONEL 690. At present, the surfacing materials of steam generator tube sheets in the third generation of nuclear power technology are all made of INCONEL 690. INCONEL 690 has experienced a change from EQNiCrFe-7 to EQNiCrFe-7A Among them, EQNiCrFe-7A is used more, but there are still some problems such as DDC cracks that have not been solved. At present, the welding strip has been developed to EQNiCrFe-14, but the crack sensitivity is still relatively large. For this reason, the technical achievements have been studied through systematic experiments. Alloying elements such as Mn and Nb for crack defects can solve the problem of crack sensitivity in large-thickness surfacing welding, but the corresponding submerged arc welding flux has not been developed for this kind of welding strip or is immature, so the development of new flux has become particularly important. Can meet the actual needs of the project
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specific Embodiment approach 1
[0018] Specific implementation mode one: a kind of flux that this embodiment is used with high Mn, the high Nb nickel-based welding strip of anti-crack defect is made of 25-50 parts of CaF in parts by mass. 2 , 5-20 parts of SiO 2 , 10-40 parts Al 2 o 3 , 8-20 parts of CaO, 4-15 parts of MgO, Cr 2 o 3 ≤5 parts, iron alloy ≤8 parts, S≤0.015 parts and P≤0.02 parts.
[0019] The manufacturing method of the flux used in conjunction with the high-Mn, high-Nb crack-resistant nickel-based welding strip in this embodiment is as follows:
[0020] Ingredients: Weigh the raw materials and put them in the same container;
[0021] Dry mixing: Stir to mix the powder evenly;
[0022] Wet mixing: add potassium sodium water glass with a modulus of 2.6 and mix evenly;
[0023] Granulation: The wet material is rotated and granulated to achieve 10-60 mesh particles;
[0024] Sintering: Carry out high-temperature sintering in an electric furnace to eliminate the moisture and crystal water ...
specific Embodiment approach 2
[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the flux is made of 38-45 parts by mass of CaF 2 , 7-14 parts of SiO 2 , 12-35 parts Al 2 o 3 , 11-18 parts of CaO, 4-12 parts of MgO, 1-4 parts of Cr 2 o 3 , iron alloy≤8 parts, S≤0.015 parts and P≤0.02 parts. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0028] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the weight percent composition of high Mn, high Nb crack defect-resistant nickel-based welding strip is C≤0.04%, Si≤0.50%, Mn≤5.0 %, S≤0.015%, P≤0.020%, Cr: 28.0-31.5%, Fe: 7.0-12.0%, Nb≤2.5%, Cu≤0.30%, Al≤0.50%, Ti≤0.50%, Mo≤0.05% , Co≤0.02%, and the balance is nickel. Others are the same as in the first or second embodiment.
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Abstract
The invention relates to a welding flux matched with a nickel-base welding strip with high Mn and high Nb crack-resistant defects, and a welding method. The invention aims to provide the welding fluxmatched with the nickel-base welding strip with the high Mn and high Nb crack-resistant defects, and the welding method. The welding flux provided by the invention is prepared from CaF2, SiO2, Al2O3,CaO, MgO, Cr2O3, an iron alloy or NaF, S and P. The welding method is characterized in that the welding current is 950 to 1100 A, the welding voltage is 28V, the welding speed is 180mm/min, and the surfacing layer thickness is 30mm. According to the welding flux matched with the nickel-base welding strip with the high Mn and high Nb crack-resistant defects, and the welding method provided by the invention, the problem of high crack sensitivity of similar products is solved, novel high-Mn high-Nb alloy components are provided, and the problem of engineering application of large-thickness heat cracks is solved. The welding flux matched with the nickel-base welding strip with the high Mn and high Nb crack-resistant defects, and the welding method provided by the invention are applied to the field of nuclear power welding.
Description
technical field [0001] The invention relates to a flux and a welding method used in conjunction with a high-Mn, high-Nb crack-resistant nickel-based welding strip. Background technique [0002] With the development of the nuclear power industry, the surface of the steam generator tube plate of the pressurized water reactor nuclear power plant requires large-scale surfacing welding of nickel-based alloys. Among them, strip surfacing materials are the most commonly used method, and the surfacing welding efficiency is high. The welding methods include: Strip electroslag surfacing and strip submerged arc surfacing, but submerged arc flux is widely used. According to the requirements of nuclear power technology and corrosive media, its material has gradually developed from INCONEL 600 to INCONEL 690. At present, the surfacing materials of steam generator tube sheets in the third generation of nuclear power technology are all made of INCONEL 690. INCONEL 690 has experienced a chan...
Claims
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