CN110842386A - Rib cavity protection method for welding U-shaped rib of titanium alloy frame vehicle body - Google Patents
Rib cavity protection method for welding U-shaped rib of titanium alloy frame vehicle body Download PDFInfo
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- CN110842386A CN110842386A CN201911128658.XA CN201911128658A CN110842386A CN 110842386 A CN110842386 A CN 110842386A CN 201911128658 A CN201911128658 A CN 201911128658A CN 110842386 A CN110842386 A CN 110842386A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/006—Vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body, which comprises the steps of firstly arranging a process hole on the upper surface of the U-shaped rib, then attaching the U-shaped rib to the surfaces of a deck and a side plate to form an extrusion cavity, controlling a gap formed by attachment to be less than 3mm, then filling argon into the extrusion cavity from the process hole to extrude and discharge air, and after the air is extruded and discharged from the extrusion cavity, starting arc welding the U-shaped rib and the deck, and the U-shaped rib and the side plate. The method can protect the root of the welding seam and the back matrix metal in the cavity by argon, ensure the welding quality of the U-shaped rib, avoid the welding seam from becoming brittle and having reduced plasticity caused by the titanium alloy absorbing oxygen, nitrogen and hydrogen in the air, and reduce the overall mechanical performance.
Description
Technical Field
The invention relates to a welding protection process technology, in particular to a rib cavity protection method for welding U-shaped ribs of a titanium alloy frame vehicle body of a special vehicle.
Background
Titanium and titanium alloy have the advantages of small density, high tensile strength, corrosion resistance and the like, have good high and low temperature performance, and are more and more widely applied to the aspects of aviation, aerospace and the like. In recent years, as the price of titanium alloy is reduced, special vehicles are gradually beginning to prove the use of titanium alloy.
Because the titanium alloy has the outstanding characteristics of high melting point, poor thermal conductivity, small linear expansion coefficient, large resistivity and the like, the titanium alloy has large metal size of a liquid molten pool, long high-temperature retention time and low cooling speed in the welding process, and simultaneously, because the titanium alloy has very active chemical properties, the titanium alloy can absorb gas in a solid state, absorb hydrogen when heated to 300 ℃, absorb oxygen at 400 ℃ and absorb nitrogen at 600 ℃, so the titanium alloy is very easy to chemically react with elements such as hydrogen, oxygen, nitrogen and the like to cause embrittlement and plasticity reduction of a welding seam, the mechanical property of a welding area is seriously reduced, and the welding quality cannot meet the requirement, so the welding pool, the welding seam with the temperature of more than 300 ℃ and a heat affected area are properly protected in the welding process. And the special type car automobile body is mostly thin shell frame welded structure, adopts the welded structure of sheet metal U type muscle, and U type muscle is the U type mostly, arranges on top, side, end deck, is interior corner joint welding seam, and if the air in U type muscle intracavity was not discharged in welding process, welding seam root and back base metal will be polluted by the air because of high temperature, reduce and connect welding quality. Currently, there are three general protection methods for welding titanium alloys: the welding method comprises the following steps of performing electron beam welding in a vacuum environment, automatically welding in an argon chamber, and welding in an air environment, wherein a welding gun is additionally provided with a dragging cover and is locally protected by argon gas.
The electron beam welding in a vacuum environment needs a vacuum chamber and a vacuum pumping system, the problems of high welding cost, low production efficiency and the like are caused because the volume of the vacuum chamber is not easily matched with the size of a special vehicle body, and the welding of U-shaped ribs in the special vehicle body cannot be realized because of the single motion posture of an electron gun; the argon chamber is adopted for welding, an argon filling system is needed, the time is long, the argon chamber is only suitable for automatic welding, the welding structure of the special vehicle body is complex, the welding seams of the U-shaped ribs are basically distributed in the vehicle body, and the space is narrow, so that the argon chamber can not meet various posture requirements of automatic welding of a machine.
At present, a titanium alloy vehicle body is welded by a third protection method generally at home and abroad, and the method can play a role in protecting the weld metal and the heat affected zone on the front surface of the titanium alloy from air pollution, and prevent the high-temperature metal of the weld on the front surface from being oxidized and nitrided. However, when the U-shaped rib of the titanium alloy car body is welded by adopting the method, the root part of the welding seam in the cavity of the U-shaped rib and the back base metal cannot be protected from air pollution
Disclosure of Invention
The invention aims to improve and innovate the defects and problems in the background technology, and provides a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body by drilling a fabrication hole on the upper surface of the U-shaped rib, injecting argon gas into an extrusion cavity from the hole by utilizing a gap formed by the joint of the U-shaped rib and a deck plane and exhausting the air in the extrusion cavity, thereby realizing the protection in the cavity of the U-shaped rib welding, and ensuring the welding quality of the root part of the welding line and the condition that the back matrix metal is not polluted by the air.
The technical scheme includes that a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body is constructed, a process hole is formed in the upper surface of the U-shaped rib, the U-shaped rib is attached to the surfaces of a deck and a side plate to form an extrusion cavity, a gap formed by attaching is controlled to be smaller than 3mm, argon is filled into the extrusion cavity from the process hole to extrude and discharge air, after the air is extruded and discharged from the extrusion cavity, the U-shaped rib and the deck, and the U-shaped rib and the side plate are welded in an arc starting mode.
Preferably, the number of the process holes formed in the U-shaped rib is determined according to the length of the welded U-shaped rib, and when the length of the U-shaped rib is less than 400mm, one process hole is drilled; when the length of the U-shaped rib is more than or equal to 400mm and less than 800mm, two process holes are symmetrically arranged by taking the left-right symmetry line of the U-shaped rib as a symmetry axis, and the distance between the two process holes is 350-400 mm; when the length of the U-shaped rib is larger than or equal to 800mm, the homogeneous partition plate can be firstly and uniformly spot-welded in the U-shaped rib, the partition plate divides extrusion cavities with the thickness of 350-400 mm, then process holes are arranged on the upper surface of the U-shaped rib on each divided extrusion cavity, and the distance between every two adjacent process holes is 350-400 mm.
Preferably, the diameter and the length of the process hole are 6-8 mm.
Preferably, the argon flow is 25-35L/min.
Preferably, the argon gas filling time is 3-5 minutes.
Preferably, the argon is filled through a combined pipe formed by sleeving the upper part of the copper pipe on the rubber hose, the lower end of the copper pipe is inserted into the technical hole during inflation, and the insertion depth is 15-20 mm.
The invention has the beneficial effects that:
the process holes are drilled on the upper surface of the U-shaped rib, argon is injected through the process holes, so that air in the U-shaped rib is extruded to be discharged from a gap formed by the U-shaped rib, a deck and a side plate in a plane fit mode, welding is started after the air in the cavity is completely discharged to form a stable argon cabin, the base metal at the root of the welding line and the back of the welding line is protected by the argon in the cavity, the welding quality of the U-shaped rib is ensured, the situation that the welding line becomes brittle and the plasticity is reduced due to the fact that the titanium alloy absorbs oxygen, nitrogen and hydrogen in the air is avoided, and the overall mechanical performance is.
Drawings
FIG. 1 is a front view of the U-shaped tendon of the present invention assembled with the deck and side panels.
Fig. 2 is a side view of the U-shaped tendon of the present invention assembled with the deck and side panels.
Description of the figures:
1-U-shaped rib, 2-partition plate, 3-copper tube, 4-rubber hose, 5-deck, 6-side plate, 7-extrusion cavity and 9-fabrication hole.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto. The embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Example 1:
a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body comprises the steps of firstly arranging a process hole 9 on the upper surface of the U-shaped rib 1, then attaching the U-shaped rib 1 to the surfaces of a deck 5 and a side plate 6 to form an extrusion cavity 7, controlling a gap formed by attaching to be less than 3mm, then filling argon into the extrusion cavity 7 from the process hole 9 to extrude and discharge air, starting arc striking and welding the U-shaped rib 1 and the deck 5, and the U-shaped rib 1 and the side plate 6 after the air is extruded and discharged from the extrusion cavity 7.
The number of the process holes 9 arranged on the U-shaped rib 1 is determined according to the length of the welded U-shaped rib 1, and when the length of the U-shaped rib 1 is less than 400mm, one process hole 9 is drilled; when the length of the U-shaped rib 1 is more than or equal to 400mm and less than 800mm, two process holes 9 are symmetrically arranged by taking the left-right symmetry line of the U-shaped rib 1 as a symmetry axis, and the distance between the two process holes 9 is 350-400 mm; when the length of the U-shaped rib 1 is larger than or equal to 800mm, the homogeneous partition plate 2 can be uniformly spot-welded in the U-shaped rib 1, the partition plate 2 is divided into extrusion cavities 7 with the thickness of 350-400 mm, then the process holes 9 are formed in the upper surface of the U-shaped rib 1 on each divided extrusion cavity 7, and the distance between every two adjacent process holes 9 is 350-400 mm.
The diameter and the length of the fabrication hole 9 are 6 mm.
The argon flow is 25L/min.
The argon gassing time was 3 minutes.
The argon is filled through a combined pipe formed by sleeving the upper part of the copper pipe 3 on the rubber hose 4, the lower end of the copper pipe 3 is inserted into the air inflation hole during air inflation, and the insertion depth is 15 mm.
Detailed explanation of the present embodiment:
the rib cavity protection method applies a pore air inlet and exhaust technology and a pneumatic flow field principle, air is introduced through a process hole 9 arranged on the upper surface of a reinforcing rib, air is exhausted through a gap formed by the bonding of the rib and a deck 5 plane, argon is injected into an extrusion cavity 7 from the process hole 9 and is extruded and exhausted, so that the cavity protection of the welding of the reinforcing rib is realized, the welding quality of the root part of a welding seam and the back matrix metal are ensured not to be polluted by air, the gap formed by bonding is less than 3mm to ensure that the air in the extrusion cavity 7 can be completely extruded, when the length of a U-shaped rib 1 is less than 400mm, one process hole 9 is drilled, when the length of the U-shaped rib 1 is less than or equal to 400mm, the length of the U-shaped rib 1 is less than or equal to 800mm, two process holes 9 are symmetrically arranged by taking the left-right symmetric line of the U-shaped rib 1 as a symmetric axis, when the length of the U-shaped rib 1 is less than or equal to 800mm, a same partition plate 2, the technical hole 9 is arranged in such a way to ensure that the introduced argon completely extrudes and discharges the air in the extrusion cavity 7, and argon is protected for the root of the weld and the back matrix metal in the cavity to ensure the welding quality, wherein the clapboard 2 is arranged in such a way that the original U-shaped rib 1 is attached to the surfaces of the deck 5 and the side plate 6 to form the extrusion cavity 7 with the length of more than 800mm, the extrusion cavity 7 is divided into a plurality of extrusion cavities 7 with the lengths of 350-400 mm, and then segmented drilling and inflation are adopted, and the argon protection is also adopted to ensure the welding quality.
Example 2:
a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body comprises the steps of firstly arranging a process hole 9 on the upper surface of the U-shaped rib 1, then attaching the U-shaped rib 1 to the surfaces of a deck 5 and a side plate 6 to form an extrusion cavity 7, controlling a gap formed by attachment to be smaller than 3mm, then filling argon into the extrusion cavity 7 from the process hole 9 to extrude and discharge air, and after the air is extruded and discharged from the extrusion cavity 7, starting arc starting to weld the U-shaped rib 1 and the deck 5, and the U-shaped rib 1 and the side plate 6.
The number of the process holes 9 arranged on the U-shaped rib 1 is determined according to the length of the welded U-shaped rib 1, and when the length of the U-shaped rib 1 is less than 400mm, one process hole 9 is drilled; when the length of the U-shaped rib 1 is more than or equal to 400mm and less than 800mm, two process holes 9 are symmetrically arranged by taking the left-right symmetry line of the U-shaped rib 1 as a symmetry axis, and the distance between the two process holes 9 is 350-400 mm; when the length of the U-shaped rib 1 is larger than or equal to 800mm, the homogeneous partition plate 2 can be uniformly spot-welded in the U-shaped rib 1, the partition plate 2 is divided into extrusion cavities 7 with the thickness of 350-400 mm, then the process holes 9 are formed in the upper surface of the U-shaped rib 1 on each divided extrusion cavity 7, and the distance between every two adjacent process holes 9 is 350-400 mm.
The diameter and the length of the fabrication hole 9 are 7 mm.
The argon flow is 30L/min.
The argon gassing time was 4 minutes.
The argon is filled through a combined pipe formed by sleeving the upper part of the copper pipe 3 on the rubber hose 4, the lower end of the copper pipe 3 is inserted into the air inflation hole during air inflation, and the insertion depth is 18 mm.
Detailed explanation of the present embodiment:
the filling of argon ensures that the base metal at the root and the back of the welding line is always in the argon protection atmosphere in the welding and cooling processes to 300 ℃, so that the situation that the welding line becomes brittle and the plasticity is reduced due to the fact that the titanium alloy absorbs oxygen, nitrogen and hydrogen in the air is avoided, and the gas protection is carried out in a segmented drilling and filling mode to ensure the welding quality
Example 3:
a rib cavity protection method for welding a U-shaped rib of a titanium alloy frame vehicle body comprises the steps of firstly arranging a process hole 9 on the upper surface of the U-shaped rib 1, then attaching the U-shaped rib 1 to the surfaces of a deck 5 and a side plate 6 to form an extrusion cavity 7, controlling a gap formed by attaching to be less than 3mm, then filling argon into the extrusion cavity 7 from the process hole 9 to extrude and discharge air, starting arc striking and welding the U-shaped rib 1 and the deck 5, and the U-shaped rib 1 and the side plate 6 after the air is extruded and discharged from the extrusion cavity 7.
The number of the process holes 9 arranged on the U-shaped rib 1 is determined according to the length of the welded U-shaped rib 1, and when the length of the U-shaped rib 1 is less than 400mm, one process hole 9 is drilled; when the length of the U-shaped rib 1 is more than or equal to 400mm and less than 800mm, two process holes 9 are symmetrically arranged by taking the left-right symmetry line of the U-shaped rib 1 as a symmetry axis, and the distance between the two process holes 9 is 350-400 mm; when the length of the U-shaped rib 1 is larger than or equal to 800mm, the homogeneous partition plate 2 can be uniformly spot-welded in the U-shaped rib 1, the partition plate 2 is divided into extrusion cavities 7 with the thickness of 350-400 mm, then the process holes 9 are formed in the upper surface of the U-shaped rib 1 on each divided extrusion cavity 7, and the distance between every two adjacent process holes 9 is 350-400 mm.
The diameter and the length of the fabrication hole 9 are 8 mm.
Aiming at the U-shaped rib 1 with the length of the welding line between the U-shaped rib 1 and the deck 5 being more than 800mm, the spot welding homogeneous partition plate 2 can be firstly used for separating in the U-shaped rib 1, and then the sectional drilling and the inflation are adopted.
The argon flow rate is 35L/min.
The argon gassing time was 5 minutes.
Detailed explanation of the present embodiment:
argon gas enters the extrusion cavity 7 through the rubber hose 4 and the copper pipe 3 in sequence. Wherein, copper pipe 3 can play a fixed effect in fabrication hole 9, and rubber hose 4 can play a sealed fabrication hole 9's effect, and because the rubber hose is flexible hose, the shape can change, therefore the combination pipe can adapt to the welding under the multiple condition, and the adaptability is stronger.
Claims (6)
1. The utility model provides a titanium alloy frame automobile body U type muscle welded muscle chamber protection method which characterized in that, set up fabrication hole (9) at first on U type muscle (1), again laminate U type muscle (1) and deck (5), curb plate (6) surface mutually and form extrusion chamber (7) to the gap that the control laminating formed < 3mm, then fill into extrusion chamber (7) with the air extrusion discharge in with argon gas follow fabrication hole (9), the air is after extrusion discharge in extrusion chamber (7), begin arc starting welding U type muscle (1) and deck (5), U type muscle (1) and curb plate (6).
2. The method for protecting the rib cavity for welding the U-shaped rib of the titanium alloy frame vehicle body according to claim 1, wherein the number of the fabrication holes (9) formed in the U-shaped rib (1) is determined according to the length of the welded U-shaped rib (1), and when the length of the U-shaped rib (1) is less than 400mm, one fabrication hole (9) is drilled; when the length of the U-shaped rib (1) is more than or equal to 400mm and less than 800mm, two process holes (9) are symmetrically arranged by taking the bilateral symmetry line of the U-shaped rib (1) as a symmetry axis, and the distance between the two process holes (9) is 350-400 mm; when the length of the U-shaped rib (1) is larger than or equal to 800mm, the homogeneous partition plate (2) can be firstly and uniformly spot-welded in the U-shaped rib (1), the partition plate (2) divides extrusion cavities (7) with the thickness of 350-400 mm, then the upper surface of the U-shaped rib (1) on each divided extrusion cavity (7) is provided with process holes (9), and the distance between every two adjacent process holes (9) is 350-400 mm.
3. The method for protecting the rib cavity of the titanium alloy frame vehicle body U-shaped rib welding according to claim 1, wherein the diameter and the length of the fabrication hole (9) are 6-8 mm.
4. The method for protecting the rib cavity of the U-shaped rib welded on the titanium alloy frame vehicle body is characterized in that the argon flow is 25-35L/min.
5. The method for protecting the rib cavity in the welding of the U-shaped rib of the titanium alloy frame vehicle body according to claim 1, wherein argon is firstly inflated for 3-5 minutes and then welded, and the argon is closed after the welding is completed for 3 minutes.
6. The method for protecting the rib cavity formed by welding the U-shaped ribs of the titanium alloy frame vehicle body according to claim 5, wherein the argon is filled through a combined pipe formed by sleeving the upper part of the copper pipe (3) on the rubber hose (4), the lower end of the copper pipe (3) is inserted into the technical hole (9) during inflation, and the insertion depth is 15-20 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128658.XA CN110842386A (en) | 2019-11-18 | 2019-11-18 | Rib cavity protection method for welding U-shaped rib of titanium alloy frame vehicle body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911128658.XA CN110842386A (en) | 2019-11-18 | 2019-11-18 | Rib cavity protection method for welding U-shaped rib of titanium alloy frame vehicle body |
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| CN201519845U (en) * | 2009-10-23 | 2010-07-07 | 江南造船(集团)有限责任公司 | Automatic tracking protective gas hood of welding gun |
| CN201702523U (en) * | 2010-05-20 | 2011-01-12 | 什邡市明日宇航工业股份有限公司 | Welding tool for external circular seam of annular titanium alloy cylinder inner container |
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Application publication date: 20200228 |