Integrated pin tool for friction stir welding and composite method of resistance-friction stir welding thereof

Abstract

The invention discloses an integrated pin tool used for friction stir welding and a composite method of resistance-friction stir welding thereof. The pin tool comprises a pin tool body arranged on a friction welder and a tool pin arranged at the lower part of the tool pin body which is connected with the welder in a clamping and insulating manner; the pin tool also comprises a forced cooling system, a current carrying system, a gas shielding system, a temperature sensing and detecting system, a sealing and insulation system, an inner shaft shoulder and the tool pin, and is an integrated pin tool which has the functions of gas shielding, forced circulation cooling of internal liquid medium, automatic temperature sensing and detection, tool pin changing and composite non-keyhole resistance-friction stir welding. The invention overcomes the difficulty of friction stir welding of the high melting point metal and meets the harsh technical requirements of the friction stir welding of the low melting point metal, improves the quality of welding joints, prolongs the service life of the pin tool and realizes the friction stir welding of high melting point metal and low melting point light alloy, with low cost, high efficiency and excellent quality.

Description

An integrated stirring head for friction stir welding and its resistance-friction stir composite welding method technical field The invention relates to the field of welding technology, in particular to an integrated stirring head for friction stir welding and a resistance stir friction composite welding method. Background technique In 1991, the British Welding Institute (TWI) invented the friction stir welding technology and obtained a patent authorization in China (ZL95192193.2). This new welding technology derived from the mechanical cold processing manufacturing process and based on solid phase bonding has obvious advantages It has become one of the welding technologies that have been rapidly developed and widely used in engineering in the world in the past two decades. The industrial application of friction stir welding is mainly concentrated in the field of aluminum alloys. With the continuous expansion of its application fields, connecting objects and materials, fri...

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Problems solved by technology

In view of the above-mentioned deficiencies existing in the existing friction stir technology, the purpose of the present invention is to provide a system integrating temperature control, parameter detection, gas protection, separate replaceable stirring needle and shaft shoulder, keyhole-free welding system, etc. The integrated intelligent friction stir welding stirring head, and a kind of internal resistance heat, with gas protection, internal liquid medium forced circulation cooling temperature control, automatic temperature sensing detection, stirring needle and shoulder can be replaced separately, without The keyhole resistance-friction stir hybrid welding method is used for the effective friction stir welding process of high melting point metals and the improvement of low melting point metal friction stir welding technology, which is a high-efficiency, low-cost, high-stability, high-quality friction stir welding The welded integrated stirring head and a new type of friction stir welding method have broken through the limitations of conventional friction stir welding technology for welding high melting point metals, and the high material preparation cost of the stirring head, harsh welding process conditions, short The service life of the stirring head is limited, and the service life of the stirring head is extended by partially replacing the stirring needle and the surface modification treatment of the shaft shoulder, which solves the high cost, low life and difficulty of welding high melting point metal of the conventional friction stir welding stirring head. question

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