JP2008049351A - Method and apparatus for ultrasonic wave-applying welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for ultrasonic wave-applying welding, by which method and apparatus, the agitation of a melted portion by the ultrasonic waves can be uniformly performed, and the melted portion can be agitated by moving an ultrasonic oscillator in synchronization with the movement of a melting means. <P>SOLUTION: A welding base material 14 is melted by being heated, and a melted portion 15 is irradiated with the ultra sonic waves in a non-contact state, and is solidified while being agitated. Further, a synchronizing means 4 is provided to synchronize the movement of melting means 5, 17 for melting the melted portion 15 with the movement of non-contact type ultrasonic wave radiating means 11, 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic additive welding method and a welding apparatus for solidifying the molten part of a weld base material while vibrating with ultrasonic waves, and more particularly, an ultrasonic additive welding method suitable for repair welding of a neutron exposed material and the welding apparatus thereof. The present invention relates to a welding apparatus.

  In general, in order to reduce local residual stress during solidification of a welded part, an ultrasonic addition welding method in which an ultrasonic transducer is brought into contact with a welding base material and solidified while the molten part is indirectly vibrated with ultrasonic waves. As shown in Non-Patent Document 1, for example, a welding apparatus has already been proposed.

Transactions of the 15th.International Conference on Structural Mechanics in Reactor Technology (SmiRT-15) Seoul, Korea, August 15-20, 1999 `` Reduction of Residual Stress by Ultrasonic Vibration During Welding '' pp. X-225 to X-261

  According to the above-described conventional technology, since the ultrasonic vibration propagates in the contact direction of the ultrasonic vibrator in order to bring the ultrasonic vibrator into contact with the welding base material, the ultrasonic vibration is not easily transmitted to the melting portion. As a result, there is a possibility that solidification of the melted portion becomes non-uniform and residual stress is generated and proceeds to weld cracking. Also, in order to bring the ultrasonic vibrator into contact with the welding base material, the ultrasonic vibrator must be firmly supported to withstand the reaction force. For this reason, the ultrasonic vibration is synchronized with the movement of the molten part. It was difficult to move the child.

  An object of the present invention is to provide an ultrasonic welding method and a welding apparatus for the same, which can uniformly agitate the melted portion by ultrasonic waves and suppress the occurrence of weld cracks.

  Another object of the present invention is to provide an ultrasonic addition welding method and a welding apparatus for the same, in which the ultrasonic vibrator can be moved in synchronization with the movement of the melting means to uniformly stir the molten portion. .

  In order to achieve the above-mentioned object, the present invention heats and melts the weld base material and irradiates the melted portion with ultrasonic waves in a non-contact manner to solidify the molten portion while vibrating the melted portion. Furthermore, a synchronizing means for synchronizing the movements of the melting means for melting the weld and the non-contact ultrasonic irradiation means is provided.

  According to the above configuration, since the ultrasonic wave can be directly applied to the melted portion and stirred, the melted portion is stirred uniformly, and as a result, the solidified portion of the melted portion becomes uniform and the occurrence of weld cracking due to residual stress is suppressed. It can be done. Furthermore, by performing non-contact ultrasonic irradiation, the melting means and the non-contact ultrasonic irradiation means can be moved synchronously, so that the molten part can be efficiently stirred and weld cracking can be achieved. Can be suppressed.

  As described above, according to the present invention, it is possible to uniformly agitate the melted portion by ultrasonic waves, and move the ultrasonic vibrator in synchronization with the movement of the melting means to uniformly agitate the melted portion. An ultrasonic additive welding method and a welding apparatus for the same can be obtained.

  A first embodiment of an ultrasonic welding apparatus according to the present invention will be described below with reference to FIGS. In the present embodiment, a non-contact type ultrasonic irradiation means is added to a tungsten inert gas arc welding apparatus.

  The tungsten inert gas arc welding apparatus includes a welding gantry 1, a welding base material support 2 that is movably supported on the welding gantry 1, and drive means 3 that moves the welding base material support 2 in one direction. The welding frame 4 fixed to the welding frame 1, the tungsten electrode 5 which is a melting means supported by the welding frame 4, and the filler wire which is a welding member supply means supported by the welding frame 4 The supply means 6 and the non-contact ultrasonic irradiation means 7 are comprised. Therefore, the welding frame 4 serves as a synchronizing means for synchronizing the movements of the tungsten electrode 5, the filler wire supplying means 6 and the non-contact ultrasonic irradiation means 7.

  The driving means 3 includes a screw rod 8 connected to the welding base material support 2 and a drive unit 9 that is screwed into the screw rod 8 and rotationally driven and supported by the welding mount 1. ing.

  The tungsten electrode 5 is connected to a power source (not shown) via a power supply line 10, and the filler wire supply means 6 is configured to deliver an appropriate amount of filler wire in synchronization with the movement by the drive means 3. Has been.

  On the other hand, the non-contact ultrasonic irradiation means 7 is formed at the transducer 11 supported by the welding frame 4, the ultrasonic generator 12 for exciting the transducer 11, and the tip of the transducer 11. And a horn 13. And the horn 13 does not contact the welding base material 14 mentioned later, ie, the vibrator | oscillator 11 is made to the welding frame 4 so that a non-contact state can be maintained with respect to the welding base material 14. FIG. In contrast, the height can be changed by advancing and retreating.

  For example, when repair welding a nuclear reactor structure that is a neutron exposed material using the tungsten inert gas arc welding apparatus having the above-described configuration, a core shroud that is a nuclear reactor structure, a core support plate, an upper lattice plate, a jet pump, etc. The welding base material 14 is fixed to the welding base material support 2, and the welded portion of the welding base material 14 is melted by the tungsten electrode 5 which is a melting means. When the welded portion is melted, the melted portion 15 is irradiated with ultrasonic waves from the horn 13. By this ultrasonic irradiation, the melted portion 15 is vibrated and uniformly stirred by the ultrasonic dense wave, and becomes uniformly adapted to the weld base material 14 during the solidification process.

  Incidentally, the frequency of the ultrasonic wave is 20 to 100 KHz, and the melted portion 15 has a residual stress in the solidification process lowered by ultrasonic agitation at a high temperature around 1000 ° C. As a result, the helium bubble generated by the neutron exposure is identified. It is possible to prevent welding cracks by preventing concentration on the part.

  Then, by driving the drive means 3 in the direction of arrow A in FIG. 1, for example, the tungsten electrode 5, the filler wire supply means 6, and the horn 13 move relatively as shown by the arrow B in FIG. And by this relative movement, the welding completion part 16 repaired one after another by the fusion | melting of the welding base material 14 and filler wire by the tungsten electrode 5, and ultrasonic irradiation from the horn 13 will be formed.

  According to the above embodiment, the ultrasonic stirring of the melting part 15 can be performed uniformly, and the vibrator 11 including the horn 13 is moved in synchronization with the movement of the melting means to uniformly stir the melting part 15. As a result, it is possible to prevent the helium bubbles generated by the neutron exposure from being concentrated at specific locations and to prevent weld cracking.

  In addition, although the said embodiment demonstrated repair welding of the reactor structure which is a neutron exposure material, it cannot be overemphasized that it can apply also to normal welding, since the fusion | melting part 15 can be stirred uniformly in the solidification process. , You can get excellent quality welding. Furthermore, although the said embodiment requires the filler wire supply means 6, depending on the purpose and repair content of welding, it can respond by omitting the filler wire supply means 6 and melting only the welding base material 14. Of course you can.

  FIG. 3 shows a second embodiment in which the ultrasonic welding apparatus is applied to a laser welding apparatus. A welding pedestal constituting a laser welding apparatus as a melting means; a welding base material supporting base supported movably on the welding base; a driving means for moving the welding base material support base in one direction; and the welding Since the welding frame fixed to the gantry, the non-contact ultrasonic irradiation means, and the configuration associated therewith are the same as those in the first embodiment, only the main parts will be described here.

  In place of the tungsten electrode of the first embodiment, a laser optical unit 17 for irradiating a laser beam constituting the melting means is provided, and a laser is guided to the laser optical unit 17 from a laser oscillation device (not shown) through an optical fiber 18. Then, the welded base material 14 is irradiated to form a melted portion 15, and the melted portion 15 is irradiated with ultrasonic waves through the vibrator 11 and the horn 13, and the melted portion 15 is vibrated and stirred in the same manner as in the first embodiment. It is possible to perform welding without causing residual stress by solidifying while making it occur. And the welding completion part 16 is formed one after another, moving the horn 13 and the laser optical part 17 together relative to the welding base material 15 in the arrow direction.

  Therefore, the present embodiment can provide the same effects as those of the first embodiment.

  FIG. 4 shows a third embodiment according to the present invention, and the basic configuration is the same as that of the first embodiment.

  A different configuration from the first embodiment is a configuration in which a magnetic stirring means is further added to a tungsten inert gas arc welding apparatus to which a non-contact ultrasonic irradiation means is added.

  That is, the magnetic stirring means installs the cylinder 19 around the tungsten electrode 5 through a gap, attaches the bobbin 20 to the outer periphery of the cylinder 19 and winds the coil 21, It is configured to generate an alternating magnetic field by supplying electric power from an alternating magnetic field generating power source, and such a magnetic stirring means is added to the tungsten inert gas arc welding apparatus. The vibrator 11 and the horn 13 of the non-contact type ultrasonic irradiation means are also provided at the same time.

  The tungsten inert gas arc welding apparatus having the above configuration melts the welding base material 14 while making the tungsten electrode 5, the horn 13, and the coil 21 relatively move in the direction of the arrow with respect to the melting portion 15 during welding and creates the melting portion 15. The melted portion 15 is solidified while being sufficiently stirred by the irradiation of ultrasonic waves and the alternating magnetic field generated by the coil 21 to reduce the residual stress in the solidification process, thereby successively producing high quality welded portions 16. It is formed continuously.

  The ultrasonic irradiation and the stirring of the melted part 15 by the alternating magnetic field may be performed simultaneously depending on the welding conditions (welding material and shape), or the ultrasonic irradiation and the generation of the alternating magnetic field may be alternately performed. Alternatively, the melted part 15 may be agitated on either side.

  FIG. 5 shows an application example in which the tungsten inert gas arc welding apparatus to which the non-contact ultrasonic irradiation means shown in FIGS. 1 and 2 is added is applied to welding of a welding base material 14 having a narrow groove.

  Usually, in the welding of the welding base material 14 having the narrow groove portion 23, the melted portion 16 becomes a narrow region, so that solidification is likely to be uneven, and poor welding is likely to occur. Therefore, it is conceivable to cause the welded base material 14 to vibrate by bringing an ultrasonic vibrator into contact with the welded base material as in the prior art, thereby solidifying the molten part while indirectly vibrating it. However, in this case, although there is a certain stirring effect, it is difficult to stir the melted portion 15 uniformly because the melted portion 15 is not directly stirred and the solidifying speed of the melted portion 15 is fast. It becomes uneven and poor welding occurs. Therefore, by directly irradiating and stirring the ultrasonic wave through the vibrator 11 and the horn 13 to the narrow melting part 15 having the narrow groove part 23, the melting part 15 can be made uniform even if the solidification speed is high. Stirring can be performed, and as a result, solidification of the melted portion 15 becomes uniform and poor welding can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows 1st Embodiment of the ultrasonic addition welding apparatus by this invention. The enlarged view which shows the fusion | melting part vicinity of the welding base material of FIG. FIG. 2 is a view corresponding to FIG. 2 showing a second embodiment of the ultrasonic welding apparatus according to the present invention. FIG. 2 is an equivalent view of FIG. 2 showing a third embodiment of the ultrasonic welding apparatus according to the present invention. FIG. 2 is a view corresponding to FIG. 2 showing an application example of the ultrasonic welding apparatus according to the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Welding base, 2 ... Welding base support stand, 3 ... Drive means, 4 ... Welding frame, 5 ... Tungsten electrode, 6 ... Filler wire supply means, 7 ... Non-contact type ultrasonic irradiation means, 8 ... Screw rod DESCRIPTION OF SYMBOLS 9 ... Drive part, 10 ... Power supply line, 11 ... Vibrator, 12 ... Ultrasonic generator, 13 ... Horn, 14 ... Welding base material, 15 ... Melting part, 16 ... Welding completion part, 17 ... Laser optical part , 18: optical fiber, 21: coil, 22: alternating magnetic field generating power source, 23: narrow groove.

Claims (8)

  An ultrasonic additive welding method characterized in that a welding base material is heated and melted, and ultrasonic waves are irradiated to the melted portion in a non-contact manner so that the melted portion is solidified while being vibrated.   Ultrasonic additive welding characterized by melting a narrow groove portion formed in a weld base material and irradiating the melted portion with ultrasonic waves in a non-contact manner to solidify the molten portion while vibrating. Method.   An ultrasonic additive welding apparatus comprising: a melting unit that heats and melts a welded portion; and a non-contact type ultrasonic irradiation unit that irradiates ultrasonic waves to the melted portion melted by the melting unit in a non-contact manner. .   A melting means for covering the welded portion with an inert gas and melting it by an arc of a tungsten electrode, and a non-contact ultrasonic irradiation means for irradiating ultrasonic waves to the molten portion melted by the melting means in a non-contact manner are provided. Ultrasonic additional welding equipment.   Ultrasonic waves characterized by comprising melting means for irradiating and melting a welded portion with a laser beam, and non-contact ultrasonic irradiation means for irradiating ultrasonic waves in a non-contact manner to the molten portion melted by the melting means Additional welding equipment.   A melting means for covering the welded portion with an inert gas and melting it by an arc of a tungsten electrode, a magnetic stirring means for magnetically stirring the molten portion melted by the melting means, and irradiating the molten portion with non-contact ultrasonic waves An ultrasonic addition welding apparatus comprising: a non-contact type ultrasonic irradiation means.   The ultrasonic welding according to claim 3, 4, 5, or 6, wherein the melting means and the non-contact ultrasonic irradiation means are integrally formed by a synchronizing means for synchronizing their movements. apparatus.   A welding member supplying means for supplying a welding member to the welded portion, a melting means for melting the welded portion together with the welding member by an arc of a tungsten electrode while being covered with an inert gas, and a melting portion melted by the melting means. Non-contact ultrasonic irradiation means for irradiating ultrasonic waves by contact; synchronization means for synchronizing the movements of the welding member supply means, melting means and non-contact ultrasonic irradiation means; and the synchronization means and the welded portion The ultrasonic addition welding apparatus provided with the drive means which moves relatively along a welding direction.

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