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Electron beam welding method for aluminium alloy pistons of high-power diesel engine

A high-power diesel engine, electron beam welding technology, applied in electron beam welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of cast iron insert ring peeling, excessive pore defects, welding seam cracking and other problems, to achieve high yield, The effect of strong penetration ability and large weld aspect ratio

Inactive Publication Date: 2011-04-20
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-power diesel engine aluminum alloy piston electron beam welding method with simple process and good welding quality. By adopting the pulse beam current electron beam welding method, the weld seam cracking and pores in the piston welding can be solved. Problems such as excessive defects, peeling of cast iron rings and collapse of weld beads

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the aluminum alloy piston with a diameter of Ф150 has a welding depth of 40-45mm, and a 150kV high-voltage numerical control vacuum electron beam welding machine is used. The main welding process parameters are as follows: acceleration voltage 138kV, vacuum degree 4×10 -4 mbar; (1) Preheating weld bead: welding beam current 20mA, welding speed 3.0m / min, focus position: surface focus; pulse frequency: 100Hz; pulse modulation: duty cycle 40%, base current 0; (2) Working weld bead: welding beam current 39mA, welding speed 0.8m / min; focus position: root focus; pulse modulation: duty cycle 40%, base current 0, pulse frequency: 500Hz; (3) modified weld bead: welding beam Current 20mA (continuous beam); welding speed: 3.0m / min; focus position: surface focus. (4) Post-weld heat treatment: 180°C, heat preservation for 2h.

Embodiment 2

[0022] In this embodiment, the aluminum alloy piston with a diameter of Φ110 has a welding depth of 20mm, and a 60kV high-voltage numerical control vacuum electron beam welding machine is used. The main welding process parameters are as follows: acceleration voltage 60kV, vacuum degree 5×10 -4 mbar, focus position: surface focus; (1) preheating weld bead: welding beam current 15mA, welding speed 1.5m / min; pulse frequency 100Hz; pulse modulation: duty cycle 55%, base current 0; (2) work Welding bead: welding beam current 30mA, welding speed 0.5m / min; pulse frequency 100Hz; pulse modulation: duty cycle 55%, base value current 0; (3) modified welding bead: welding beam current 15mA (continuous beam current); Welding speed: 1.0m / min; focus position: surface focus; (4) post-weld heat treatment: heating at 180°C and holding for 2h.

[0023] Compared with the electron beam welding of the direct current continuous beam current, the weld depth ratio of the direct current continuous bea...

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Abstract

The invention relates to an electron beam welding method for aluminium alloy pistons of a high-power diesel engine. The method is characterized by comprising the following steps: washing and assembling the pistons, and ensuring the assembling clearance to be 0-0.03mm; carrying out weld preheating treatment on the assembled pistons; transferring the pistons after preheating treatment to a vacuum chamber the vacuum degree of which is higher than 5*10<-4>mba, and carrying out pulsed electron beam welding by utilizing 150kV high-voltage electron beam welding equipment or 60kV high-voltage electron beam welding equipment; adopting corresponding electron beam welding parameters according to the welding penetration; modifying weld seams by modification welding after welding; and finally carryingout heat treatment. By utilizing the method provided by the invention, the electron beam penetrability in aluminium alloy piston welding is greatly improved, the weld heat input is reduced, the weld seams with high depth-to-width ratio (40:1) can be obtained, the problems of spalling of cast iron rings and collapse of internal cooling oil channels during welding in aluminium alloy piston welding are solved, and the porosity of the weld seams is ensured to be less than 1%. The method has the characteristics of simple process and high yield.

Description

technical field [0001] The invention relates to the field of welding, in particular to an electron beam welding process for aluminum-silicon alloy pistons, which is suitable for welding aluminum alloy pistons of various types of high-power diesel engines. Background technique [0002] The piston is the most critical moving part of the internal combustion engine. It bears the action of repeated alternating loads under high temperature and high pressure, and is called the heart of the internal combustion engine. At present, high power, high speed, low heat dissipation, low fuel consumption and light weight have become the development direction of engines. With the continuous improvement of engine power, higher requirements are placed on the performance of piston materials. Because aluminum alloy has a series of advantages such as low density, high specific strength, and good thermal conductivity, it is widely used as a piston manufacturing material. Generally speaking, cast a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/00
Inventor 王英马冰程朝丰甄立玲陈东亮常贵如罗建民
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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