Method for welding piston by electron beam
An electron beam welding and piston technology, which is applied in electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problem that the mechanical energy of the piston piston is not high, cannot bear high power, high strength and tensile force engine power, and affects the piston Performance quality and other issues to achieve the effect of improving performance
Active Publication Date: 2010-11-24
湖南江滨机器(集团)有限责任公司
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Problems solved by technology
[0002] At present, the manufacture of pistons is mainly processed by integral casting. The strength of the pistons and the mechanical energy of the pistons are not high, and it cannot bear the power requirements of high-power, high-strength and tensile-resistant engines; Most of the positions of the welding seam are welded twice, and the size of the air holes below 30% in the arc closing part after welding is controlled at 3*5mm, and there are a large number of air holes in the welding part of the assembly surface, which seriously affects the performance and quality of the welded piston; Therefore, it is imminent to find a method of applying electron beam to weld different materials of pistons to meet the needs of high-performance engines.
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Embodiment 1
[0046] The head and group of the piston are machined, and the assembly surface of the head and group of the welded piston must be guaranteed to be over-melted. The welding surface is processed by a CNC machine tool, and the roughness is guaranteed to be below 5um to ensure that the assembly surface There is no large amount of gas retention, and the welding pores are controlled within a small range; this process ensures that the tolerance of the machining mating surface is within plus or minus 5mm, and the welding surface is an over-melting fit;
[0047] Heating the head of the piston in a heating furnace;
[0048] Assemble the head and group of the piston; heat the head in the furnace below 200 degrees Celsius, heat for 2 hours, place the head in the group of the designed special fixture, keep the pressure for 3 minutes, and then assemble and head Clean the assembly surface with industrial absolute ethanol or acetone before putting it into the furnace to remove oil stains and ...
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The embodiment of the invention discloses a method for welding a piston by an electron beam, which comprises the following steps: respectively machining the head and skirt of a piston; heating the head of the piston in a heating furnace; assembling the head and the skirt of the piston; putting the integral piston in the heating furnace to weld a circumferential seam between the head and the skirt of piston; carrying out thermal insulation on the welded piston; putting the integral piston in the heating furnace to weld the top seam of the piston; carrying out thermal insulation on the welded piston; and carrying out heat treatment on the piston, and machining the integral piston. The method ensures that 99% of air holes (3*5 mm) at the welding arc-off position of the welded piston can not be more than 10, thereby greatly enhancing the performance of the welded piston.
Description
technical field [0001] The invention relates to the technical field of electron beam welding, and more specifically, relates to a method for electron beam welding of a piston. Background technique [0002] At present, the manufacture of pistons is mainly processed by integral casting. The strength of the pistons and the mechanical energy of the pistons are not high, and it cannot bear the power requirements of high-power, high-strength and tensile-resistant engines; Most of the positions of the welding seam are welded twice, and the size of the air holes below 30% in the arc closing part after welding is controlled at 3*5mm, and there are a large number of air holes in the welding part of the assembly surface, which seriously affects the performance and quality of the welded piston; Therefore, it is imminent to find a method of using electron beam to weld different materials of pistons to meet the needs of high-performance engines. Contents of the invention [0003] In vi...
Claims
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IPC IPC(8): B23P15/10B23K15/00
Inventor 杨志勇刘胜袁超刘鹏飞刘亮
Owner 湖南江滨机器(集团)有限责任公司