US Patent No: 5,486,684

Number of patents in Portfolio can not be more than 2000

Multipass induction heating for thermoplastic welding

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Importance

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Abstract

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An induction coil is passed over an interface between two resinous parts to be welded and an alternating magnetic field generated by the coil induces eddy currents in a foraminous susceptor positioned in the interface between the two parts. Pressure is applied to squeeze the two parts together while the induction heating of the susceptor raises the temperature of the resin in the faying surfaces of the two parts to the softening temperature so that resin flows through the interstices in the susceptor and bonds the two parts together. The induction heating and pressure application passes are repeated four or more times, increasing the power to the induction coil in the later passes to increase the heat input. The strength and continuity of the weld improves with each pass, although the incremental improvement diminishes after about four passes.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE BOEING COMPANYCHICAGO, IL10046

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Peterson, Todd R Federal Way, WA 14 28
Walker, Michael A Kuna, ID 127 3198

Cited Art Landscape

Patent Info (Count) # Cites Year
 
The Boeing Company (3)
4,355,222 Induction heater and apparatus for use with stud mounted hot melt fasteners 96 1981
4,673,450 Method of welding together graphite fiber reinforced thermoplastic laminates 46 1985
5,313,037 High power induction work coil for small strip susceptors 58 1991
 
AJAX TOCCO MAGNETHERMIC CORPORATION (2)
4,897,518 Method of monitoring induction heating cycle 64 1988
5,250,776 Apparatus and method of measuring temperature 45 1991
 
EDUARD KUSTERS MASCHINENFABRIK GMBH & CO. KG (2)
5,079,817 Apparatus for controlling the heating and cooling of a roll 43 1989
5,283,409 Coil body for the inductive heating of rollers 36 1992
 
Energy Development Associates, Inc. (2)
4,343,982 Method of joining metal to graphite by spot welding 39 1981
4,382,113 Method for joining graphite to graphite 47 1981
 
Measurex Corporation (2)
4,768,433 Hot air calender roll controller 42 1985
4,653,396 Recirculating air calender roll controller 47 1985
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (2)
4,313,777 One-step dual purpose joining technique 75 1979
4,521,659 Induction heating gun 81 1983
 
Barmag Barmer Maschinenfabrik AG (1)
4,304,975 Inductively heatable godet 45 1979
 
EDISON WELDING INSTITUTE, INC. (1)
5,313,034 Thermoplastic welding 78 1992
 
GLACIER GARLOCK BEARINGS, INC. (1)
4,421,588 Plastics alloy compositions 60 1982
 
HITACHI, LTD. (1)
4,904,972 Gas-insulated stationary induction electrical apparatus 45 1989
 
HYDRO-QUEBEC (1)
5,101,086 Electromagnetic inductor with ferrite core for heating electrically conducting material 90 1990
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
4,296,295 Induction heating coil 46 1980
 
MURATA MANUFACTURING CO., LTD. (1)
5,199,791 Temperature sensor 46 1991
 
Northrop Corporation (1)
4,978,825 Thermoplastic composite induction welder 46 1989
 
ROLLS-ROYCE PLC (1)
4,445,951 Method of manufacturing composite materials 64 1982
 
Sulzer-Escher Wyss GmbH (1)
5,074,019 Roll with induction heating arrangement 61 1989
 
SUMITOMO ELECTRIC INDUSTRIES, LTD. (1)
4,947,464 Heating coil assembly for an electromagnetic induction cooking assembly 36 1988
 
Teijin Seiki Co., Ltd. (1)
4,822,972 Bearing cooling apparatus of heating roller 40 1987
 
TETRA PAK HOLDINGS S.A. (1)
5,001,319 Arrangement for continuous induction welding 45 1990
 
TOYO SEIKAN KAISHA, LTD. (1)
4,288,673 High frequency induction heating apparatus 35 1979
 
VALMET PAPER MACHINERY INC. (1)
4,919,759 Control of detachment of a paper web from a roll using heat 39 1988
 
WST Power Electronics, Inc. (1)
4,791,260 Induction type electrical wire preheater 34 1987
 
Other [Check patent profile for assignment information] (1)
4,416,713 Method and apparatus for joining abutting edges of sheet material 83 1980

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
The Boeing Company (11)
5,660,669 Thermoplastic welding 10 1994
5,710,412 Fluid tooling for thermoplastic welding 3 1995
5,756,973 Barbed susceptor for improviing pulloff strength in welded thermoplastic composite structures 8 1995
5,688,426 Hybrid metal webbed composite beam 25 1995
5,760,379 Monitoring the bond line temperature in thermoplastic welds 17 1995
5,705,796 Reinforced composites formed using induction thermoplastic welding 10 1996
5,902,935 Nondestructive evaluation of composite bonds, especially thermoplastic induction welds 28 1997
5,833,799 Articulated welding skate 2 1997
6,613,169 Thermoplastic rewelding process 5 1998
6,284,089 Thermoplastic seam welds 27 1998
6,323,468 Static coil apparatus and method for welding thermoplastic composite structures 11 2000
 
SAINT-GOBAIN PERFORMANCE PLASTICS CORPORATION (3)
7,323,666 Inductively heatable components 2 2003
7,745,355 Inductively heatable components 3 2007
8,721,823 Method of forming large diameter thermoplastic seal 0 2009
 
AIRBUS OPERATIONS GMBH (1)
8,864,077 Method for connecting a first material to a second material in aircraft construction 0 2008
 
APPLIED MATERIALS, INC. (1)
7,566,850 Method of hot wire welding of plastics 0 2006
 
OMG, INC. (1)
7,141,768 Fastening device 3 2001