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1. 发明专利

JPS55120481A MULTIELECTRODE WELDING METHOD 失效
公开(公告)号：JPS55120481A
公开(公告)日：1980-09-16
申请号：JP2558879
申请日：1979-03-07
申请人： HITACHI LTD
发明人： TAGUCHI FUMIO , NIHEI MASASUKE , OGURA SATOSHI , ASHITA EIJI
IPC分类号： B23K9/00 , B23K9/06 , B23K9/073 , B23K9/16 , B23K9/167
摘要： PURPOSE:To stabilize the starting and connection of arc even if the changeover frequencies of welding current are low by flowing base current to each electrode according to the magnitude of the mean current at the arc starting generated by flowing welding current alternately to each electrode and during welding. CONSTITUTION:Welding current is changed over by current changeover element groups 2, 2A and are supplied from a welding power supply 1 to electrodes 3, 3A and the base metals 6 connected to the power supply via current reverse-flow-blocking diode 7 are welded. If at this time, the changeover frequency is 1kHz or less, arc starting and sustaining characteriscs are unstable and therefore, base current is flowed to the electrodes 3, 3A via resistances 4A, 4 from a power source 5. The base current for this purpose is made larger in proportion of the magnitude of the mean welding current but is made to the current which hardly causes arc interference. The same holds true even when the electrodes are not less than two.

2. 发明专利

JPS5499046A METHOD AND APPARATUS FOR GAS SHIELDED WELDING AND GAS SHIELDED WELDING TORCH 失效
公开(公告)号：JPS5499046A
公开(公告)日：1979-08-04
申请号：JP527378
申请日：1978-01-23
申请人： HITACHI LTD
发明人： SATOU AKIRA , WACHI HIROSHI , OGURA SATOSHI , ASHITA EIJI
IPC分类号： B23K9/29 , B23K9/12
摘要： PURPOSE:To surely and economically cool welding torch and to easily carry out continuous welding and large current welding, by jetting shield gas from gas nozzle after using as cooling medium of welding torch. CONSTITUTION:Optional gas, for example, Ar, CO2 gas etc., used as shield gas at welding time, is continuously supplied from the cylinder for shield gas 20 to the passage for cooling medium 32 by optional pressure. Rise in temperature of the gas nozzle 14 is prevented by the above gas during welding. The gas sent out from the passage, is cooled by the heat radiating apparatus 34 and is jetted and used as the shield gas of molten metal part from the nozzle 14 again.

3. 发明专利

JPS55139174A MULTIPLE ELECTRODE DIFFERENT POLARITY WELDING METHOD 失效
公开(公告)号：JPS55139174A
公开(公告)日：1980-10-30
申请号：JP4536779
申请日：1979-04-16
申请人： HITACHI LTD
发明人： TAGUCHI FUMIO , ASHITA EIJI , NIHEI MASASUKE , OGURA SATOSHI
IPC分类号： B23K9/073 , B23K9/00
摘要： PURPOSE:To prevent occurrence of arc between electrodes and realize stable welding, in multiple electrode welding, by setting one electrode in reverse polarity and the other one in positive polarity, and controlling the direction of currents flowing into each electrode within the same time always in the same direction. CONSTITUTION:Transistor element groups 2, 2' are connected parallel to welding power sources 1, 1', and the welding currents flowing into the transistor element groups 2, 2' are determined by current control circuits 5, 5'. The currents flowing into the transistors are controlled to welding current waveform D by means of polarity changing elements 4, 4' composed of thyristors 3, 3', and an arc is fired between nonconsumable electrodes 6, 6' and base metal 7. When the polarity of each electrode is different, conventionally, arcs were fired between the electrodes, so that welding was previously impossible. In this method, on the other hand, the directions of current flowing into electrodes within the same time are constant, and arc is not fired between electrodes 6, 6', so that stable arc firing between the electrodes 6, 6' and base metal 7 may be enabled.

4. 发明专利

JPS555134A GROOVE POSITION MEMORY METHOD BY TELEVISION IMAGE 失效
公开(公告)号：JPS555134A
公开(公告)日：1980-01-16
申请号：JP7652678
申请日：1978-06-26
申请人： HITACHI LTD
发明人： OGURA SATOSHI , NIHEI MASASUKE , ASHITA EIJI
IPC分类号： H04N7/18 , B23K9/12 , B23K9/127
摘要： PURPOSE:To prevent the stray running of welding torch by programs when the contrast of the groove becomes obscure by image-analyzing the groove position of the material to be welded from TV image and taking the signal from the TV image into a computer. CONSTITUTION:A TV camera 1 and a torch 3 are fixed to a welding head 2 by means of a clamp 4 around the material 5 to be welded, such as piping or other. The signal from the TV camera 1 is binary coded in a binary coding circuit 6 and is temporarily stored in an outside memory 7. This signal is stored in a random-access- memory 9 by the central processing unit 10 in the microcomputer and is further outputted as a groove follow-up signal in a TV monitor 8 and digital-analog converter 12. The signal is then sent to the welding head 2 by a servo circuit 13. With this method, welding is continued even when the weld groove becomes high owing to the lamination of beads and the shape of the groove end is unidentifiable with the TV image.

5. 发明专利

JPS54159359A MIG ARC WELDING METHOD 失效
公开(公告)号：JPS54159359A
公开(公告)日：1979-12-17
申请号：JP6765478
申请日：1978-06-07
申请人： HITACHI LTD
发明人： SATOU AKIRA , WACHI HIROSHI , OGURA SATOSHI , ASHITA EIJI
IPC分类号： B23K9/16 , B23K9/173
摘要： PURPOSE:To make large the amount of the deposited metal, and to execute the MIG arc welding with a good shape of penetration and a small rate of dilution, by feeding the arbitrary filler wire into the molten metal in which the molten particle of the welding wire is forced to cause the spray transfer. CONSTITUTION:The electrode wire 1 contacts with the work 3 to be welded, the arc 4 is generated, and the welding is executed. While the welding work, when the spray transfer is caused in a small molten particle, the filler wire 5 is always fed into the molten metal 9 formed by the arc. According to this method, the generation of the spatter is prevented, the amount of the deposited metal is increased, and the shape of penetration is rounded. By this method, a great effect is given to the overlay welding and the joint welding.

6. 发明专利

JPS56131067A ARC WELDING 失效
公开(公告)号：JPS56131067A
公开(公告)日：1981-10-14
申请号：JP3276280
申请日：1980-03-17
申请人： HITACHI LTD
发明人： NIHEI MASASUKE , OGURA SATOSHI , ASHITA EIJI , TAGUCHI FUMIO
IPC分类号： B23K9/00 , B23K9/06 , B23K9/073
摘要： PURPOSE:To prevent occurrence of nonwelded part between electrodes and to improve welding quality, by supplying a pulselike arc current to plural electrodes arranged on the welding line so that the current may overlap each other, and then moving the arc successively. CONSTITUTION:One of switching elements 21 connected to a plural electrodes 26 is turned on, and the arc is generated by the high-frequency arc starter, and then the arc is moved successively by turning on or off switching element 21 of each electrode 26 by controlling device 22, and thus the welding is performed. At this time, the arc is ignited successively and stably by supplying a small current necessary to maintain the arc to all electrode 26 through resistance 25 connected to switching elements 21 in parallel.

7. 发明专利

JPS5499754A METHOD AND APPARATUS FOR AUTOMATIC CONTROL OF ARC WELDING 失效
公开(公告)号：JPS5499754A
公开(公告)日：1979-08-06
申请号：JP622978
申请日：1978-01-25
申请人： HITACHI LTD
发明人： ASHITA EIJI , NIHEI MASASUKE , WACHI HIROSHI , SATOU AKIRA , OGURA SATOSHI
IPC分类号： B23K9/095 , B23K9/12 , B23K9/127 , G06T1/00
摘要： PURPOSE:To prevent the influence of optical noise, etc., by taking alternately the optical information on two or more kinds of different ranges of wavelength of arc weld zone, and by extracting and controlling different element. CONSTITUTION:For automatically controlling the arc welding, the variation in width of groove, position of torch, extension of electrode, width of molten pool, etc., are detected and controlled. The optical device 19 consists of TV camera 20, filter turning jig 24, filter motor 26, the first semicircular filter for the penetrating wavelength ranging from 500 to 600nm, the second filter 30 for penetrating wavelength above 1000nm, etc. From the picture taken in through the first filter 28, can be measured the distance T between the vertical reference line A and the center line C of the welding torch image B, the distance ST between the horizontal reference line D and the tip of welding torch image B, the width K of the groove image E, etc.; and from the picture taken in through the second filter 30, can be detected the width W of molten pool image F and the distance WP between the horizontal reference line D and the center line G of molten pool image F.

8. 发明专利

JPS53131250A PREPARATION OF COMPOSITE ROLL BY WELDING 失效
公开(公告)号：JPS53131250A
公开(公告)日：1978-11-15
申请号：JP4569777
申请日：1977-04-22
申请人： HITACHI LTD
发明人： SATOU AKIRA , OGURA SATOSHI , WACHI HIROSHI , ASHITA EIJI
IPC分类号： B22D19/00 , B23K25/00
摘要： PURPOSE:To manufacture the composite roll without having the weld defect, by making the core material by electroslag fusion method and successively carrying out overlay welding of the surface part by electroslag welding method, after cooling to a fixed temperature slowly.

9. 发明专利

JPS53119746A SUPERVISORY UNIT OF WELDING 失效
公开(公告)号：JPS53119746A
公开(公告)日：1978-10-19
申请号：JP3442677
申请日：1977-03-30
申请人： HITACHI LTD
发明人： ASHITA EIJI , WACHI HIROSHI , OGURA SATOSHI , KOZONO YUUZOU
IPC分类号： B23K31/00 , B23K9/00 , B23K9/095 , B23K37/00
摘要： PURPOSE:To enable to carry out accurate control, being suitable for welding condition, by receiving the light from the lens system supervisory eye, provided rotatable around the torch for welding, as televisional picture by the optical system and carrying out driving control of supervisory eye, watching the above picture.

10. 发明专利

JPS55106679A ARC WELDING METHOD 失效
公开(公告)号：JPS55106679A
公开(公告)日：1980-08-15
申请号：JP1427179
申请日：1979-02-13
申请人： HITACHI LTD
发明人： ASHITA EIJI , NIHEI MASASUKE , TAGUCHI FUMIO , OGURA SATOSHI
IPC分类号： B23K9/00 , B23K9/16 , B23K9/167
摘要： PURPOSE:To enable automatic welding of high thermal conduction material by preventing occurrence of blow hole, by heating the vicinity of weld zone to a temperature below the melting point simultaneously, and restricting scatter of heat in the direction vertical to the weld line, when welding the work with main electrode. CONSTITUTION:A welding torch 1 is equipped with a main electrode 2 for welding, and electrodes 3, 4 for preventing heat scattering, and each electrode is energized from a power supply 5 through a switching device 6 to perform welding by generating an arc 8 between the electrode and a work 7. The device 6 consists of a group of transistor elements 9, and the current is passed by switching alternately in a control device 10 in order to prevent arc interference among three electrodes. The electrodes 2 to 4 are disposed in a line vertical to the direction of weld line 11. Welding is performed by forming a molten pool 12 with the electrode 2, and the solidification rate of the pool is adjusted by the electrodes 3, 4 thereby forming an excellent bead 13. Since preheating is not required in this process, the method may be automated.

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