JP6295312B1 - Welding method - Google Patents

Welding method Download PDF

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JP6295312B1
JP6295312B1 JP2016227859A JP2016227859A JP6295312B1 JP 6295312 B1 JP6295312 B1 JP 6295312B1 JP 2016227859 A JP2016227859 A JP 2016227859A JP 2016227859 A JP2016227859 A JP 2016227859A JP 6295312 B1 JP6295312 B1 JP 6295312B1
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welding
base material
holder
load voltage
current
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忠広 富樫
忠広 富樫
一哉 村井
一哉 村井
秀彦 保坂
秀彦 保坂
古川　博基
博基 古川
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Taihei Dengyo Kaisha Ltd
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Abstract

【課題】母材に設置された付帯部材の迷走溶接電流による焼損防止を確実に図ることができる溶接方法を提供する。【解決手段】溶接機２の二次側端子２ａ、２ｂに、母材１に電気的に接続される母材側帰線４と溶接ホルダ５が取り付けられたホルダ側配線６とを接続し、溶接ホルダ５に取り付けられた溶接棒と母材１との間にアークを発生させて溶接を行う溶接方法において、溶接機２の負荷電圧（Ｖ）と溶接電流（Ｉ）とを検出し、溶接中に負荷電圧（Ｖ）が設定値を超えた場合には、溶接異常と判断して、溶接機２の電源を切って、溶接を中断し、溶接開始時に溶接電流（Ｉ）が検出されない場合には、溶接異常と判断せず、溶接を実行する。【選択図】図１To provide a welding method capable of surely preventing burning of an incidental member installed on a base material due to stray welding current. A secondary side terminal 2a, 2b of a welding machine 2 is connected to a base material side return wire 4 electrically connected to the base material 1 and a holder side wiring 6 to which a welding holder 5 is attached. In a welding method in which an arc is generated between a welding rod attached to a welding holder 5 and a base material 1 to perform welding, load voltage (V) and welding current (I) of the welding machine 2 are detected, and welding is performed. When the load voltage (V) exceeds the set value, it is determined that the welding is abnormal, the welding machine 2 is turned off, the welding is interrupted, and the welding current (I) is not detected at the start of welding. In this case, welding is performed without judging that the welding is abnormal. [Selection] Figure 1

Description

この発明は、溶接方法、特に、母材に設置された付帯部材が迷走溶接電流による電気抵抗加熱により焼損することを未然に防止することができる溶接方法に関するものである。   The present invention relates to a welding method, and more particularly to a welding method that can prevent an incidental member installed on a base material from being burned out by electric resistance heating due to stray welding current.

図３に示すように、母材１に電気溶接を施すには、溶接機２の一方の二次側端子２ａに、母材１にクランプ３により電気的に接続される母材側帰線４を接続し、溶接機２の他方の二次側端子２ｂに、溶接ホルダ５が取り付けられたホルダ側配線６を接続し、溶接ホルダ５に取り付けられた溶接棒と母材１との間にアークを発生させて溶接を行っている。   As shown in FIG. 3, in order to perform electric welding on the base material 1, the base material side return 4 that is electrically connected to the base material 1 by a clamp 3 to one secondary side terminal 2 a of the welding machine 2. Is connected to the other secondary side terminal 2 b of the welding machine 2, the holder side wiring 6 to which the welding holder 5 is attached is connected, and an arc is formed between the welding rod attached to the welding holder 5 and the base material 1. Welding is generated.

しかし、溶接電流が何らかの原因により母材１に設置された電気抵抗値の高い付帯部材７に迷走溶接電流となって流れた場合、付帯部材７が迷走溶接電流により電気抵抗加熱されて、付帯部材７の保護材などが焼損するおそれがあった。   However, when the welding current flows as a stray welding current to the auxiliary member 7 having a high electric resistance value installed on the base material 1 due to some cause, the auxiliary member 7 is heated by the stray welding current and is electrically heated. There was a risk that the protective material of No. 7 would burn out.

また、別の例として、図４に示すように、母材が一方の母材１ａと他方の母材１ｂとに分離され、母材側帰線４が一方の母材１ａに接続され、溶接ホルダ５の溶接棒と他方の母材１ｂとの間にアークを発生させて溶接を行う場合において、例えば、配線保護用の付帯部材としての可撓性金属管８が一方の母材１ａと他方の母材１ｂと間に電気的に接触して張り渡されている場合、可撓性金属管８は、薄肉で電気抵抗値が高いので、可撓性金属管８が迷走溶接電流により抵抗加熱されて、可撓性金属管８の保護材としての被覆ゴムが焼損するおそれがあった。   As another example, as shown in FIG. 4, the base material is separated into one base material 1a and the other base material 1b, and the base material side return wire 4 is connected to one base material 1a, and welding is performed. In the case where welding is performed by generating an arc between the welding rod of the holder 5 and the other base material 1b, for example, a flexible metal tube 8 as an accessory member for wiring protection is connected to one base material 1a and the other base material 1b. When the flexible metal tube 8 is stretched in electrical contact with the base metal 1b, the flexible metal tube 8 is thin and has a high electric resistance value. Therefore, the flexible metal tube 8 is heated by resistance by stray welding current. As a result, the covering rubber as the protective material of the flexible metal tube 8 may be burned out.

この場合、付帯部材としては、可撓性金属管８以外に、一方の母材１ａと他方の母材１ｂとの間に張り渡されている他の金属製部材であっても、金属製部材の保護材が焼損するおそれがあった。   In this case, as the incidental member, in addition to the flexible metal tube 8, even if it is another metal member stretched between one base material 1a and the other base material 1b, the metal member There was a risk of burning the protective material.

上述した問題は、母材１が分離されていない場合には、母材側帰線４のクランプ３による母材１への接続位置を、溶接の進行に伴って溶接個所の近傍位置にこまめに移動させれば発生しないが、クランプ３の着脱を怠ると発生するおそれがある。   The problem described above is that when the base material 1 is not separated, the connection position of the base material-side return wire 4 to the base material 1 by the clamp 3 is frequently set in the vicinity of the welding location as welding progresses. It does not occur if moved, but may occur if the clamp 3 is not attached or detached.

また、上述したように、母材が一方の母材１ａと他方の母材１ｂとに分離され、両者が電気的に同一でない場合には、焼損が発生するおそれがある。   In addition, as described above, when the base material is separated into one base material 1a and the other base material 1b, and they are not electrically identical, there is a risk of burning.

溶接異常の検出方法の一例が、例えば、特許文献１に開示にされているが、この方法は、上述したように、母材１に設置された付帯部材７の溶接電流による焼損防止を図るものではない。   An example of a method for detecting a welding abnormality is disclosed in, for example, Patent Document 1, which, as described above, is intended to prevent burning of the incidental member 7 installed on the base material 1 due to welding current. is not.

特開平７−２７６０７５号公報Japanese Patent Laid-Open No. 7-276075

このようなことから、母材に設置された付帯部材が迷走溶接電流による電気抵抗加熱により焼損することを未然に防止することができる溶接方法の開発が望まれているが、このような溶接方法は、未だ提案されていない。   For this reason, it is desired to develop a welding method that can prevent incidental members installed on the base material from being burned out by electric resistance heating due to stray welding current. Has not yet been proposed.

従って、この発明の目的は、母材に設置された付帯部材が迷走溶接電流による電気抵抗加熱により焼損することを未然に防止することができる溶接方法を提供することにある。   Accordingly, an object of the present invention is to provide a welding method capable of preventing an incidental member installed on a base material from being burned out by electric resistance heating due to stray welding current.

この発明は、上記目的を達成するためになされたものであって、下記を特徴とするものである。   The present invention has been made to achieve the above object, and is characterized by the following.

請求項１に記載の発明は、溶接機の二次側端子に、一方の母材に電気的に接続される母材側帰線と溶接ホルダが取り付けられたホルダ側配線とを接続し、前記溶接ホルダに取り付けられた溶接棒と、前記一方の母材と間隔をあけて分離した他方の母材との間にアークを発生させて溶接を行い、前記一方の母材と前記他方の母材との間には、付帯部材が電気的に接触して張り渡されている溶接方法において、前記溶接機の負荷電圧と溶接電流とを検出し、溶接中に前記負荷電圧が設定値を超えた場合には、溶接異常と判断して、前記溶接機の電源を切って、溶接を中断し、溶接開始時に前記溶接電流が検出されない場合には、溶接異常と判断せず、溶接を実行することに特徴を有するものである。 The invention according to claim 1 connects, to the secondary side terminal of the welding machine, a base material side return wire electrically connected to one base material and a holder side wiring to which a welding holder is attached, An arc is generated between a welding rod attached to a welding holder and the other base material separated from the one base material with a gap between them, and the one base material and the other base material are welded. In the welding method in which the auxiliary members are stretched in electrical contact with each other, the load voltage and welding current of the welding machine are detected, and the load voltage exceeds a set value during welding. In such a case, it is determined that the welding is abnormal, the power of the welding machine is turned off, the welding is interrupted, and if the welding current is not detected at the start of welding, the welding is not determined and the welding is performed. It has the characteristics.

請求項２に記載の発明は、請求項１に記載の発明において、前記付帯部材は、被覆ゴムを有する可撓性金属管からなっていることに特徴を有するものである。 The invention according to claim 2 is characterized in that, in the invention according to claim 1, the auxiliary member is made of a flexible metal tube having a covering rubber .

請求項３に記載の発明は、請求項１または２に記載の発明において、前記設定値は、溶接が正常に行われている場合の負荷電圧であることに特徴を有するものである。   The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the set value is a load voltage when welding is normally performed.

この発明によれば、溶接中に負荷電圧が設定値を超えた場合には、溶接機の電源が切られ、溶接が中断されるので、母材に設置された付帯部材が迷走溶接電流による電気抵抗加熱により焼損すること防止することができる。   According to the present invention, when the load voltage exceeds the set value during welding, the power of the welding machine is turned off and the welding is interrupted, so that the incidental member installed on the base metal is electrically connected by stray welding current. It is possible to prevent burning by resistance heating.

また、この発明によれば、溶接開始時における溶接の中断を防止することができる。すなわち、溶接開始時において、溶接棒を母材に接触させた時には、負荷電圧が設定値を超えて高くなるので、負荷電圧のみの検出による場合には、溶接が中断されるが、負荷電圧と溶接電流とを検出し、溶接開始時において溶接電流が検出されなかった場合には、溶接を中断しないようにすることによって、溶接開始時における溶接の中断を防止することができる。   Moreover, according to this invention, the interruption of welding at the time of a welding start can be prevented. That is, when the welding rod is brought into contact with the base material at the start of welding, the load voltage becomes higher than the set value, so that the welding is interrupted when only the load voltage is detected. When the welding current is detected and no welding current is detected at the start of welding, it is possible to prevent the welding from being interrupted at the start of welding by preventing the welding from being interrupted.

この発明による溶接方法を示す回路図である。It is a circuit diagram which shows the welding method by this invention. この発明による別の溶接方法を示す回路図である。It is a circuit diagram which shows another welding method by this invention. 従来の溶接方法を示す回路図である。It is a circuit diagram which shows the conventional welding method. 母材が分離されている場合の溶接方法を示す回路図である。It is a circuit diagram which shows the welding method in case the base material is isolate | separated.

この発明の溶接方法の一実施態様を、図面を参照しながら説明する。   One embodiment of the welding method of the present invention will be described with reference to the drawings.

図１は、この発明による溶接方法を示す回路図である。   FIG. 1 is a circuit diagram showing a welding method according to the present invention.

図１において、１は、母材、２は、溶接機、４は、溶接機２の一方の二次側端子２ａと母材１との間にクランプ３を介して電気的に接続された母材側帰線、６は、溶接機２の他方の二次側端子２ｂに接続されたホルダ側配線６であり、溶接ホルダ５が取り付けられている。   In FIG. 1, 1 is a base material, 2 is a welder, and 4 is a base electrically connected via a clamp 3 between one secondary side terminal 2 a of the welder 2 and the base material 1. The material side blanking line 6 is a holder side wiring 6 connected to the other secondary side terminal 2b of the welding machine 2, and a welding holder 5 is attached thereto.

９は、検出器である。検出器９は、溶接機２の負荷電圧（Ｖ）を求め、負荷電圧（Ｖ）が設定値を超えた場合には、溶接異常と判断して、溶接機２の電源を切る機能を有している。検出器９と一方の二次側端子２ａとは検出線１１により接続され、検出器９と他方の二次側端子２ｂとは検出線１２により接続されている。さらに、検出器９は、電流計１０により溶接電流を検出し、溶接開始時において溶接電流（Ｉ）が検出されなかった場合には、負荷電圧（Ｖ）が設定値を超えた場合であっても、溶接機２の電源を切る指令を溶接機２に送らない機能を有している。なお、負荷電圧（Ｖ）は、溶接開始時において、溶接棒を母材に接触させた時に設定値を超えて高くなる。一方、溶接電流は、溶接棒を母材に接触させた時には流れず、アークが発生したときに流れる。従って、負荷電圧（Ｖ）が高くなった原因は、溶接棒を母材に接触させたことにあることが、溶接電流を検出することによって把握することができる。   9 is a detector. The detector 9 obtains the load voltage (V) of the welding machine 2 and, when the load voltage (V) exceeds the set value, determines that the welding is abnormal and has a function of turning off the power of the welding machine 2. ing. The detector 9 and one secondary terminal 2 a are connected by a detection line 11, and the detector 9 and the other secondary terminal 2 b are connected by a detection line 12. Furthermore, the detector 9 detects the welding current with the ammeter 10 and when the welding current (I) is not detected at the start of welding, the load voltage (V) exceeds the set value. In addition, it has a function of not sending a command to turn off the power of the welding machine 2 to the welding machine 2. The load voltage (V) becomes higher than the set value when the welding rod is brought into contact with the base material at the start of welding. On the other hand, the welding current does not flow when the welding rod is brought into contact with the base material, but flows when an arc is generated. Therefore, it can be grasped by detecting the welding current that the load voltage (V) is increased because the welding rod is brought into contact with the base material.

負荷電圧（Ｖ）は、ホルダ側配線６の電気抵抗（Ｒ１）と、溶接ホルダ５とクランプ３との間の電気抵抗（Ｒ２）と、母材側帰線４の電気抵抗（Ｒ３）と、溶接電流（Ｉ）とにより、下記（１）式により求めることができる。設定値は、この状態で溶接が正常に行われている場合の電圧値である。   The load voltage (V) includes the electric resistance (R1) of the holder side wiring 6, the electric resistance (R2) between the welding holder 5 and the clamp 3, the electric resistance (R3) of the base metal side return line 4, and It can obtain | require by the following (1) Formula with welding current (I). The set value is a voltage value when welding is normally performed in this state.

Ｖ＝Ｉ（Ｒ１＋Ｒ２＋Ｒ３） ---（１）   V = I (R1 + R2 + R3) --- (1)

この発明によれば、母材１を流れる溶接電流が何らかの原因により母材１に設置された電気抵抗値の高い付帯部材７に、迷走溶接電流となって流れた場合には、溶接ホルダ５とクランプ３との間の電気抵抗（Ｒ２）が大きくなるので、負荷電圧（Ｖ）が設定値を超え、これによって、検出器９から溶接機２に電源を切る指令が発せられるので、溶接中に付帯部材７が迷走溶接電流によって電気抵抗加熱されて、その保護材などが焼損するおそれが回避される。   According to the present invention, when the welding current flowing through the base material 1 flows as a stray welding current to the auxiliary member 7 having a high electrical resistance value installed on the base material 1 for some reason, Since the electrical resistance (R2) between the clamp 3 and the load voltage (V) exceeds the set value, a command to turn off the power from the detector 9 to the welding machine 2 is issued. It is avoided that the auxiliary member 7 is heated by electric resistance by stray welding current and the protective material or the like is burned out.

なお、溶接開始時において、溶接棒を母材に接触させた時には、負荷電圧（Ｖ）が設定値を超えて高くなるので、溶接が中断されるおそれがあるが、この発明によれば、溶接電流を検出し、溶接開始時において溶接電流が検出されなかった場合には、検出器９から溶接機２に電源を切る指令が発せられないので、溶接開始時における溶接の中断を防止することができる。   At the start of welding, when the welding rod is brought into contact with the base material, the load voltage (V) becomes higher than the set value, so that welding may be interrupted. When the current is detected and no welding current is detected at the start of welding, the command to turn off the power from the detector 9 to the welding machine 2 is not issued, so that interruption of welding at the start of welding can be prevented. it can.

図２は、この発明による別の溶接方法を示す回路図である。   FIG. 2 is a circuit diagram showing another welding method according to the present invention.

この例は、母材が一方の母材１ａと他方の母材１ｂとに分離され、母材側帰線４が一方の母材１ａにクランプ３を介して接続され、ホルダ側配線６に接続された溶接ホルダ５の溶接棒と他方の母材１ｂとの間にアークを発生させて溶接を行う場合において、配線保護用の付帯部材としての可撓性金属管８が一方の母材１ａと他方の母材１ｂと間に電気的に接触して張り渡されている場合である。この場合、可撓性金属管８は、薄肉で電気抵抗値が高いので、可撓性金属管８が迷走溶接電流により電気抵抗加熱され、可撓性金属管８の被覆ゴムが焼損するおそれがあった。   In this example, the base material is separated into one base material 1a and the other base material 1b, the base material side return wire 4 is connected to one base material 1a via the clamp 3, and is connected to the holder side wiring 6 When welding is performed by generating an arc between the welding rod of the welded holder 5 and the other base material 1b, a flexible metal tube 8 as an auxiliary member for wiring protection is connected to the one base material 1a. This is a case where it is stretched in electrical contact with the other base material 1b. In this case, since the flexible metal tube 8 is thin and has a high electric resistance value, the flexible metal tube 8 is heated by electric resistance due to stray welding current, and the covering rubber of the flexible metal tube 8 may be burned out. there were.

この発明によれば、母材１を流れる溶接電流が何らかの原因により母材１に設置された電気抵抗値の高い可撓性金属管８に迷走溶接電流となって流れた場合には、溶接ホルダ５とクランプ３との間の電気抵抗（Ｒ５）が大きくなるので、負荷電圧（Ｖ）が設定値を超え、これによって、検出器９から溶接機２に電源を切る指令が発せられるので、溶接中に可撓性金属管８が迷走溶接電流によって電気抵抗加熱されて、その保護材などが焼損するおそれが回避される。   According to the present invention, when the welding current flowing through the base material 1 flows as a stray welding current through the flexible metal pipe 8 having a high electrical resistance value installed on the base material 1 for some reason, the welding holder Since the electrical resistance (R5) between 5 and the clamp 3 is increased, the load voltage (V) exceeds the set value, thereby issuing a command to turn off the power from the detector 9 to the welding machine 2. The possibility that the flexible metal tube 8 is electrically resistance-heated by stray welding current and the protective material or the like is burned out is avoided.

この場合の負荷電圧（Ｖ）は、ホルダ側配線６の電気抵抗（Ｒ４）と、溶接ホルダ５とクランプ３との間の電気抵抗（Ｒ５）と、母材側帰線４の電気抵抗（Ｒ６）と、溶接電流（Ｉ）とにより、下記（２）式により求めることができる。   In this case, the load voltage (V) includes the electric resistance (R4) of the holder side wiring 6, the electric resistance (R5) between the welding holder 5 and the clamp 3, and the electric resistance (R6) of the base metal side return line 4. ) And the welding current (I), the following equation (2) can be obtained.

Ｖ＝Ｉ（Ｒ４＋Ｒ５＋Ｒ６） ---（２）   V = I (R4 + R5 + R6) --- (2)

この発明によれば、溶接電流が電気抵抗値の高い可撓性金属管８に迷走溶接電流となって流れた場合において、溶接ホルダ５とクランプ３との間の電気抵抗（Ｒ５）が大きくなるので、負荷電圧（Ｖ）が設定値を超え、これによって、検出器９から溶接機２に電源を切る指令が発せられる。この結果、可撓性金属管８が迷走溶接電流により電気抵抗加熱されて、その被覆ゴムが焼損するおそれが回避される。設定値は、図１において、溶接が正常に行われている場合の電圧値である。   According to the present invention, when the welding current flows as a stray welding current through the flexible metal pipe 8 having a high electric resistance value, the electric resistance (R5) between the welding holder 5 and the clamp 3 increases. Therefore, the load voltage (V) exceeds the set value, and accordingly, a command to turn off the power is issued from the detector 9 to the welding machine 2. As a result, the possibility that the flexible metal tube 8 is electrically resistance-heated by the stray welding current and the covering rubber is burned out is avoided. The set value is a voltage value when welding is normally performed in FIG.

この例においても、溶接開始時において、溶接棒を母材に接触させた時には、負荷電圧（Ｖ）が設定値を超えて高くなるので、溶接が中断されるおそれがあるが、この発明によれば、溶接電流を検出し、溶接開始時において溶接電流が検出されなかった場合には、検出器９から溶接機２に電源を切る指令が発せられないので、溶接開始時における溶接の中断を防止することができる。   Also in this example, when the welding rod is brought into contact with the base material at the start of welding, the load voltage (V) becomes higher than the set value, so that welding may be interrupted. For example, if a welding current is detected and no welding current is detected at the start of welding, a command to turn off the power from the detector 9 to the welding machine 2 is not issued, thus preventing interruption of welding at the start of welding. can do.

なお、上記何れの溶接方法においても、設定値は、図１において、溶接が正常に行われている場合の負荷電圧である。   In any of the above-described welding methods, the set value is a load voltage when welding is normally performed in FIG.

以上、説明したように、この発明によれば、溶接中に負荷電圧が設定値を超えた場合には、溶接機の電源が切られ、溶接が中断されるので、母材に設置された付帯部材が迷走溶接電流による電気抵抗加熱により焼損すること防止することができる。   As described above, according to the present invention, when the load voltage exceeds a set value during welding, the welding machine is turned off and the welding is interrupted. It is possible to prevent the member from being burned out by electric resistance heating due to stray welding current.

また、この発明によれば、溶接開始時における溶接の中断を防止することができる。   Moreover, according to this invention, the interruption of welding at the time of a welding start can be prevented.

１：母材
１ａ：一方の母材
１ｂ：他方の母材
２：溶接機
２ａ：一方の二次端子
２ｂ：他方の二次端子
３：クランプ
４：母材側帰線
５：溶接ホルダ
６：ホルダ側配線
７：付帯部材
８：可撓性金属管
９：検出器
１０：電流計
１１：検出線
１２：検出線 1: Base material 1a: One base material 1b: The other base material 2: Welding machine 2a: One secondary terminal 2b: The other secondary terminal 3: Clamp 4: Base material side return 5: Welding holder 6: Holder side wiring 7: Attached member 8: Flexible metal tube 9: Detector 10: Ammeter 11: Detection line 12: Detection line

Claims (3)

溶接機の二次側端子に、一方の母材に電気的に接続される母材側帰線と溶接ホルダが取り付けられたホルダ側配線とを接続し、前記溶接ホルダに取り付けられた溶接棒と、前記一方の母材と間隔をあけて分離した他方の母材との間にアークを発生させて溶接を行い、前記一方の母材と前記他方の母材との間には、付帯部材が電気的に接触して張り渡されている溶接方法において、
前記溶接機の負荷電圧と溶接電流とを検出し、溶接中に前記負荷電圧が設定値を超えた場合には、溶接異常と判断して、前記溶接機の電源を切って、溶接を中断し、溶接開始時に前記溶接電流が検出されない場合には、溶接異常と判断せず、溶接を実行することを特徴とする溶接方法。 A base metal side return wire electrically connected to one base material and a holder side wiring to which a welding holder is attached are connected to the secondary side terminal of the welding machine, and a welding rod attached to the welding holder; The welding is performed by generating an arc between the one base material and the other base material separated at an interval, and an auxiliary member is provided between the one base material and the other base material. In the welding method stretched in electrical contact ,
The load voltage and welding current of the welding machine are detected, and if the load voltage exceeds a set value during welding, it is determined that the welding is abnormal, the welding machine is turned off, and the welding is interrupted. When the welding current is not detected at the start of welding, welding is performed without determining that the welding is abnormal. 前記付帯部材は、被覆ゴムを有する可撓性金属管からなっていることを特徴とする、請求項１に記載の溶接方法。 The welding method according to claim 1 , wherein the auxiliary member is made of a flexible metal tube having a covering rubber . 前記設定値は、溶接が正常に行われている場合の負荷電圧であることを特徴とする、請求項１または２に記載の溶接方法。   The welding method according to claim 1, wherein the set value is a load voltage when welding is normally performed.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5331030U (en) * 1976-08-23 1978-03-17
JP2007253196A (en) * 2006-03-23 2007-10-04 Ihi Corp Method of and apparatus for seal-welding pipe end
JP2015013313A (en) * 2013-07-08 2015-01-22 株式会社神戸製鋼所 Abnormality monitoring device of automatic welding machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5331030U (en) * 1976-08-23 1978-03-17
JP2007253196A (en) * 2006-03-23 2007-10-04 Ihi Corp Method of and apparatus for seal-welding pipe end
JP2015013313A (en) * 2013-07-08 2015-01-22 株式会社神戸製鋼所 Abnormality monitoring device of automatic welding machine

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