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1. 发明专利

JPH0825051A PLASMA KEYHOLE WELDING METHOD 失效
公开(公告)号：JPH0825051A
公开(公告)日：1996-01-30
申请号：JP15902194
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： F16L13/02 , B23K9/028 , B23K10/02 , B23K31/00 , B23K37/053
摘要： PURPOSE:To prevent a molten pool from melting down by making the width of groove gap at a groove face larger than a specific dimension. CONSTITUTION:The groove gap width of an object to be welded 3 is made larger than 0.5mm. A plasma arc 2 is discharged from a keyhole 5 after penetrating the object to be welded 3, and it is bent by an angle theta in the same direction as the welding direction. The discharged plasma arc 2 does not re-heat the keyhole 5, and the phenomenon of enlarging or dropping down of the molten pool 4 is restricted. Chamfering of C0.5 to C3 at the groove edge in the opposite side of the welding torch 1 is more effective. Swinging the welding torch 1 in the direction orthogonally crossing against the welding line is desirable. Therefore, the high speed welding can be realized stably even if the thickness of the object to be welded 3 is larger than 6mm.

2. 发明专利

JPH0825052A PLASMA KEYHOLE WELDING METHOD OF PIPELINE FIXED PIPE 失效
公开(公告)号：JPH0825052A
公开(公告)日：1996-01-30
申请号：JP15902294
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： F16L13/02 , B23K9/028 , B23K9/035 , B23K10/02
摘要： PURPOSE:To obtain a plasma keyhole welding method of a pipeline fixed pipe which forms high-quality penetration beads by using a back shield. CONSTITUTION:A gaseous mixture composed of an inert gas and gaseous O2 and/or CO2 is supplied a back shielding gas. The compounding ratio of the gaseous O2 is specified to 2 to 10vol.% of the entire part of the back shielding gas in the case of the gaseous mixture composed of the inert gas and the O2 and the mixing ratio of the gaseous CO2 is 5 to 30vol.% of the entire part of the back shielding gas in the case of the gaseous mixture composed of the inert gas and the CO2. The compounding ratio of the gaseous O2 is 2 to 5vol.% and the compounding ratio of the C02 is 5 to 20vol.% of the entire part in the case of the gaseous mixture composed of the inert gas and the O2 and the CO2. As a result, the high-quality penetration beads are formed and stable welding even with thick materials to be welded is possible. Expansion of the adequate welding region is thus possible.

3. 发明专利

JPH0825050A WELDING METHOD OF FIXED TUBE IN PIPELINE 失效
公开(公告)号：JPH0825050A
公开(公告)日：1996-01-30
申请号：JP15902094
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： F16L13/02 , B23K9/028 , B23K9/095 , B23K9/12 , B23K10/02
摘要： PURPOSE:To improve the welding efficiency by running two welding trucks installing welding torches on the outer circumference, and avoiding the upward welding by a plasma keyhole welding. CONSTITUTION:In a pipeline fixed tube welding method to butt a pipeline fixed tube 3 and to weld the butted end faces in the circumferential direction, two welding trucks 1, 2 moving in the circumferential direction on the outer circumference of the fixed tube 3 are installed. While both trucks 1, 2 are moved from the position of 12 of the upper part of the fixed tube 3 toward the lower part in mutually opposite directions, the initial layer welding is executed with plasma keyhole welding by using the welding torch installed on each welding truck, after the welding trucks 1, 2 are made reach the lower part of the fixed tube 3, they are turned back toward the upper part and the secondary layer is welded.

4. 发明专利

JPH0825049A METHOD FOR WELDING ALL POSITION OF PIPE LINE FIXING TUBE 失效
公开(公告)号：JPH0825049A
公开(公告)日：1996-01-30
申请号：JP15901994
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： B23K10/02 , B23K9/028 , B23K10/00
摘要： PURPOSE:To provide an all position welding method of a pipe line fixing tube which can execute plasma key hole welding with all position welding onto the pipe line fixing tube of the range of so-called a thick plate. CONSTITUTION:In a method to execute plasma key hole welding onto a pipe line fixing tube in all position, a welding current is impressed in a pulse like, the supplying velocity of a welding wire is changed in the pulse like at the same time, the difference between the peak current value of the welding current and the base current value is made lower than 150A, the ratio of the peak current value and the base current value is set in 1:1 to l:6, and the welding current and the supplying velocity of the above welding wire are synchronized in the same phase or the reverse phase at the same time.

5. 发明专利

JPH0825046A METHOD FOR CONTROLLING PLASMA ARC WELDING 失效
公开(公告)号：JPH0825046A
公开(公告)日：1996-01-30
申请号：JP15901894
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： F16L13/02 , B23K9/095 , B23K10/00 , B23K10/02
摘要： PURPOSE:To avoid the re-welding in the post process by judging the quality of a welding part during welding, correcting the welding condition in order to stabilize the welding part during welding and obtaining the welding part with the excellent quality in a time of executing the plasma key hole welding. CONSTITUTION:The range of welding voltage during welding is regulated within + or -3V by detecting the voltage fluctuation during welding, and regulating the distance between a welding torch and a base material and/or the current value in the range within 15% based on this detecting signal. The monitoring time of this voltage fluctuation is 0.2 to 0.4 sec. By the voltage fluctuation, no- existing of the internal defect, nothing of burn through or dropping down, or nothing of key hole forming can be detected.

6. 发明专利

JPH0825053A PLASMA KEYHOLE WELDING METHOD USING BACKING PLATE 失效
公开(公告)号：JPH0825053A
公开(公告)日：1996-01-30
申请号：JP15902394
申请日：1994-07-11
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： KOMORI MITSUNORI , YAMAMOTO YASUSHI , SUEZAWA SHINYA , YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： B23K10/02 , B23K9/035
摘要： PURPOSE:To provide a plasma keyhole welding method using a backing plate where the plasma keyhole welding can be compatible with a backing welding, and both of the highly efficient welding of the plasma keyhole welding having the high temperature and high speed, and the stable and highly efficient welding using the backing plate are provided combinedly. CONSTITUTION:A root gap 2 is opened in 0.5 to 3.0mm, a groove of a shape machined with a 6 of C0.5 to C3.0 is installed at the edge part of a back face side, a backing plate 3 installed with a slit 4 of the width being more than 3.0mm is arranged on the back side of this groove by coordinating the slit 4 into the root gap 2 and the plasma key hole welding is executed.

7. 发明专利

JPH08267241A JUDGING METHOD OF BACK BEAD FORMING CONDITION AT WELDING 失效
公开(公告)号：JPH08267241A
公开(公告)日：1996-10-15
申请号：JP7499695
申请日：1995-03-31
申请人： KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： YOSHINO FUMITO , TOCHIO YOSHITSUNE , TAGASHIRA SHIGEYOSHI , NAKANISHI RYOTA , OKUBO NORIAKI
IPC分类号： G01J3/30 , B23K9/095 , B23K26/00 , B23K31/00
摘要： PURPOSE: To provide a judging method of the back bead forming condition capable of being applied to various welding methods such as TIG welding, plasma welding, laser beam welding, simultaneously judging the back bead forming condition during the welding in a simple method, and stabilizing the quality in the automatic welding technology. CONSTITUTION: The intensity of the light to be emitted from a part to be welded is detected by an optical fiber 3 and a spectroscope 4, and the back bead forming condition is judged by the fluctuation of the intensity of the emitted light. When the intensity of the emitted light is lowered, it is judged that the burn through is foreboded, and when the intensity of the emitted light is increased and the fluctuation becomes large, it is judged that the burn through is generated.

8. 发明专利

JPH0866774A PLASMA KEY HOLE WELDING METHOD 失效
公开(公告)号：JPH0866774A
公开(公告)日：1996-03-12
申请号：JP20752494
申请日：1994-08-31
申请人： KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： B23K10/02 , B23K9/028 , B23K10/00
摘要： PURPOSE: To provide the key hole welding method capable of stably executing welding of plasma key hole at all positions and obtaining high quality weld zone. CONSTITUTION: The tube butted in horizontal or inclined position is subjected to plasma key hole welding in full-circled welding by executing part by part from the outside peripheral side and inside peripheral side of tube. In the case a position of weld line is shown in clockwise display, the starting point of welding from the outside peripheral side of tube is set to nine half to eleven half, the finishing point to three half to five half, the welding is advanced clock- wise. Further, the starting point of welding from the inside peripheral side of tube is set to nine half to eleven half, the finishing point to three half to five half, the welding is advanced counter-clockwise.

9. 发明专利

JPH0839259A GAS PULSE PLASMA WELDING METHOD 失效
公开(公告)号：JPH0839259A
公开(公告)日：1996-02-13
申请号：JP17842894
申请日：1994-07-29
申请人： KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： B23K10/02 , B23K10/00
摘要： PURPOSE:To make the most of plasma welding so as to stably execute formation of key hole and deep penetration welding without generating defect of burn through, etc., of molten pool. CONSTITUTION:The gas plasma welding method is that a gas flow rate of plasma gas flow is periodically varied in pulse state. Plasma gas flow is varied so that a period of peak gas flow rate Q1 and a period of base gas flow Q2 are alternately varied in pulse state and the period of base gas flow Q2 is 0.3 to 1 times of the peak flow rate Q1, the base flow rate Q2 is 0.3 to 0.7 times of the peak gas flow rate Q1. Further, between the peak gas flow period and base gas flow period, there is a period of one or >=2 of the flow between the peak gas flow rate and base gas flow rate. Further, a filler metal wire is supplied into the molten pool formed backward in the welding advancing direction by plasma arc column, the method is suitable for welding a horizontal fixed tube in all positions.

10. 发明专利

JPH0839243A BACK SHIELD WELDING METHOD 失效
公开(公告)号：JPH0839243A
公开(公告)日：1996-02-13
申请号：JP17800494
申请日：1994-07-29
申请人： KOBE STEEL LTD , SHINKO PLANT KENSETSU KK
发明人： YOSHINO FUMITO , OKUBO NORIAKI
IPC分类号： B23K9/16 , B23K9/035 , B23K10/02
摘要： PURPOSE:To enable plasma key hole welding of a thick welding material by one pass by using a mixed gas composed of a combustible gas and an inert gas, as a back shield gas that is supplied to the rear side of the groove face of the material to be welded. CONSTITUTION:A material 1 to be welded is arranged on a rear side protecting jig 2 with the joining end face brought into contact with the jig. A back shield gas 9 is supplied from a gas bomb 3 to the internal space of the rear side protecting jig 2. A plasma gas and a shield gas 8 are supplied to a plasma torch 5. A plasma arc 7 is produced by applying a voltage between the torch 5 and the welding material 1 from a welding power source 6. The torch 5 is moved along a welding line, and the welding material 1 is welded. The plasma arc 7 penetrating through the rear side of the welding material 1 is brought into contact with the back shield gas 9, in which the combustible gas is burnt, preventing the attenuation of the plasma arc 7. The plasma arc 7 penetrates the welding material 1 even if the thickness is for example 10mm or more.

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