Electric heating plug welding technique for engine
A welding process and glow plug technology, applied in the direction of electron beam welding equipment, welding equipment, welding/welding/cutting items, etc.
Active Publication Date: 2013-01-23
SHANGHAI MICROPOWERS
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Problems solved by technology
[0008] The present invention provides a welding process for engine glow plugs, which solves the problems of poor reliability, short service life and low production efficiency in traditional welding processes. The advantages of good reliability, high production efficiency and low cost
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[0019] Such as figure 1 As shown, the glow plug is the core component of the engine igniter, which is composed of a connection tube 1, a casing 2, a heating wire 4 and an internal filler 3, etc. The glow plug casing 2 covers the heating wire 4 inside, and the heating wire 4 is filled with trioxide Dialuminum and other oxides, the glow plug shell 2 is made of high-temperature alloy, and the wall thickness is very thin, usually 0.3-0.8mm. The material of connecting pipe 1 is generally austenitic stainless steel. The connecting pipe 1 and the shell 2 are connected together to form a seal to prevent the gas from leaking to the outside through the seam of the glow plug. The connecting pipe 1 and shell 2 are generally connected by cold pressing or welding. figure 1 Middle A is the connecting part between the connecting pipe 1 and the shell 2.
[0020] When the engine is running, the glow plug is in a high-temperature flame or gas, especially in applications such as a heat engi...
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Abstract
The invention discloses an electric heating plug welding technique for an engine, which is realized in this way: a. carrying out surface treatment on an electric heating plug part to be welded, and removing oil stain and impurities on the surface of the electric heating plug part; b. assembling and fixing the electric heating plug to be welded according to the requirement of electric heating plugassembling technique; c. heating by adopting a workpiece rotating method; d. moving the assembled and fixed electric heating plug into an electron beam vacuum chamber to be isolated and vacuumized with the vacuum degree of 1*10-2Pa; e. using a vacuum electron beam welding machine for carrying out electron beam brazing on the electric heating plug, wherein the accelerating voltage U1 is equal to 20-150kV, the electron beam current Ib is equal to 15-30mA, the focus current IF is equal to 400-480mA, the workpiece rotating speed is 8-12r / min, and the temperature of 1050-1100DEG C is maintained for 40-70s when in welding. The technique has the advantages of high welding reliability, long service life, high production efficiency and low cost.
Description
technical field [0001] The invention belongs to the field of electron beam welding, in particular to an electron beam welding process for a glow plug used in an engine. Background technique [0002] The glow plug is generally composed of a shell, a heating wire, and an internal filler. The surrounding of the heating wire is filled with oxides such as aluminum oxide. The shell is a very thin high-temperature alloy with a wall thickness of about 0.3mm to 0.8mm. The wire is connected to the external power supply, heats up rapidly, and ignites the combustible gas. Glow plugs are widely used in the fields of internal combustion engines, boilers, heat engines, etc., especially in the field of engines. The connection process of other parts has always been a difficult point in the manufacture of glow plugs. The key point is to form a seal for high-temperature gas to prevent high-temperature gas from entering the interior of the glow plug and affecting its working life. The traditi...
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IPC IPC(8): B23K15/06B23K101/36
Inventor 陈国强陈志林
Owner SHANGHAI MICROPOWERS