WO2016129388A1 - 重ね隅肉アーク溶接継手 - Google Patents
重ね隅肉アーク溶接継手 Download PDFInfo
- Publication number
- WO2016129388A1 WO2016129388A1 PCT/JP2016/052254 JP2016052254W WO2016129388A1 WO 2016129388 A1 WO2016129388 A1 WO 2016129388A1 JP 2016052254 W JP2016052254 W JP 2016052254W WO 2016129388 A1 WO2016129388 A1 WO 2016129388A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lap fillet
- welded joint
- fillet arc
- plate
- arc welded
- Prior art date
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- 238000003466 welding Methods 0.000 claims description 53
- 230000000630 rising effect Effects 0.000 claims description 16
- 239000011324 bead Substances 0.000 abstract description 15
- 238000009661 fatigue test Methods 0.000 description 47
- 229910000831 Steel Inorganic materials 0.000 description 34
- 239000010959 steel Substances 0.000 description 34
- 238000012360 testing method Methods 0.000 description 27
- 239000002184 metal Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 12
- 238000005452 bending Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/08—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of welds or the like
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2101/18—Sheet panels
-
- 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
- B23K2101/28—Beams
Definitions
- the present invention relates to a lap fillet arc welding joint of a sheet metal welded structure such as an automotive part.
- weight reduction of reduction automobile of body
- high-strength steel sheets can be used to reduce the thickness of the steel sheet (full vehicle) Can contribute to weight reduction.
- chassis frame parts and undercarriage parts are joined by arc welding, and when welding two parts, the end of one of the two parts and the surface of the other part In many cases, lap fillet arc welding is employed in which the two are welded along the end of the one part.
- the present invention has been made to solve the above-mentioned problems in chassis frame parts and underbody parts, and in the case where two plates (metal plates) are overlapped and overlapped by arc welding, the cost and It aims at providing the lap fillet arc welding joint which is excellent in fatigue strength, without increasing the number of processes.
- a lap fillet arc welded joint is formed by stacking two plates and placing the end of one plate and the surface of the other plate on the one plate.
- a lap fillet arc welded joint welded along the edge of the other plate, provided with a bead-shaped projection projecting on the surface side of the other plate, and the top of the bent projection The weld toe is located at
- the lap fillet arc welded joint according to the present invention is characterized in that the top is flat.
- the lap fillet arc welded joint according to the present invention is characterized in that, in the above invention, the curvature radius of the rising portion of the bent convex portion on the non-welded side of the bent convex portion is 0.8 mm or more.
- a lap fillet arc welded joint is formed by stacking two plates and placing the end of one plate and the surface of the other plate on the one plate.
- a bead-shaped bent convex portion protruding on the surface side of the other plate, and one of the inclined surface portions (inclined surface surface portion) of the bent convex portion.
- a weld toe portion is located on the inclined surface portion on the side to be welded with the end portion of the plate.
- the lap fillet arc welded joint according to the present invention is formed by stacking two plates and welding the end of one plate and the surface of the other plate along the end of the one plate, In parallel with the end of one plate, the weld toe is positioned at the top of the bead-shaped bent projection protruding from the surface of the other plate or the inclined surface of the side to be welded.
- the lap fillet arc welded joint according to the present invention suppresses stress concentration at the weld toe, and therefore can prevent fatigue failure from the weld toe.
- the fatigue strength of the joined parts joined by the lap fillet arc welded joint can be improved.
- FIG. 1 is a cross-sectional view of a lap fillet arc welded joint according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view illustrating a lap fillet arc welded joint of the present invention and a conventional lap fillet arc welded joint.
- FIG. 3 is a cross-sectional view of another aspect of the lap fillet arc welded joint according to one embodiment of the present invention.
- FIG. 4 is a perspective view of an example of an automobile undercarriage component joined by a lap fillet arc welded joint according to the present invention.
- FIG. 5 is a cross-sectional view of a lap fillet arc welded joint according to another embodiment of the present invention.
- FIG. 1 is a cross-sectional view of a lap fillet arc welded joint according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view illustrating a lap fillet arc welded joint of the present invention and a conventional
- FIG. 6 is a cross-sectional view illustrating a lap fillet arc welded joint according to another embodiment of the present invention.
- FIG. 7 is an explanatory diagram of a welding method in the first and second embodiments.
- FIG. 8 is an explanatory view of the shape of a fatigue test piece in a plane bending fatigue test in Example 1 and Example 2.
- FIG. 9 is an explanatory diagram of a fatigue test method in Example 1 and Example 2.
- FIG. 10 is an explanatory diagram of the shape of the bent convex portion in the first embodiment.
- FIG. 11 is a diagram of a fatigue test result in Example 1.
- FIG. 12 is an explanatory diagram of the shape of the lap fillet arc welded joint in the second embodiment.
- the lap fillet arc welded joint 1 is formed by stacking two plates, and an end portion of one plate (the side wall portion 9 a of the upper part 9).
- the weld toe part 1a is positioned at the top of the bead-shaped bent convex part 5. As described above, it is joined linearly by arc welding.
- the lap fillet arc welded joint 1 protrudes in parallel to the end of the vertical wall 9a of the upper part 9 and to the surface side of the vertical wall 3a of the lower part 3 to be welded to the end.
- the bead-shaped bent convex part 5 is formed.
- the reason why the fatigue strength of the lap fillet arc welded joint 1 is improved by providing the bent protrusion 5 on the lower part 3 and arc welding with the end of the upper part 9 is as follows. This will be described with reference to FIG.
- the cross-sectional shape of the portion where the metal plates overlap is the surface of the lower part 13 and the upper part 9. It becomes a right-angled shape by the edge part of a metal plate (dotted line in Fig.2 (a)).
- the crossing points with the surface of each of them become the weld toe part 11a and the weld toe part 11b, respectively.
- the weld toe portion 1a on the lower part 3 side where the bent convex portion 5 is formed is a bent convex portion. Located at the top of 5.
- the stress concentration factor K t when stress is concentrated on the lap fillet arc welded joint 1 and the lap fillet arc welded joint 11 having such a shape is calculated by the following equation (1).
- ⁇ is a flank angle
- ⁇ is a radius of curvature
- T is an overlap thickness
- t is a lower plate thickness.
- h is the weld bead height (the difference in the plate thickness direction between the top of the weld bead and the weld toe).
- the lap fillet arc welded joint 1 according to the present invention shown in FIG. 2B is welded to the top of the bent convex portion 5 as compared with the conventional lap fillet arc welded joint 11 shown in FIG.
- the end 1a is located. Therefore, in the lap fillet arc welded joint 1, the weld bead height h is reduced, and the rise of the molten metal at the weld toe 1b is reduced. As a result, in the lap fillet arc welded joint 1, the flank angle ⁇ at the weld toe 1a is increased.
- the portion corresponding to the weld toe 11a of the conventional lap fillet arc welded joint 11 is the weld toe 1a of the bent convex portion 5. Therefore, the lap fillet arc welded joint 1 can alleviate stress concentration at the weld toe 1a by increasing the radius of curvature ⁇ (see FIG. 2B) at the weld toe 1a. Strength can be improved.
- the stress concentration coefficient K t is also small.
- the weld bead height h of the lap fillet arc welded joint 1 according to the present invention is significantly smaller than the weld bead height h of the conventional lap fillet arc welded joint 11 shown in FIG. Therefore, according to the present invention, the fatigue strength can be sufficiently improved.
- lap fillet arc welded joint 1 As described above, lap fillet arc welded joint 1 according to the present invention, it is possible to reduce the stress concentration factor K t than conventional lap fillet arc welded joint 11, can be improved fatigue strength It becomes.
- the bending convex part 5 formed in the lower part 3 may have a shape with a flat top as shown in FIG. 3 (see A in FIG. 3).
- the flank angle ⁇ and the radius of curvature ⁇ of the weld toe portion 1a located on the lower part 3 side are increased. Therefore, the stress concentration at the weld toe 1a can be relaxed. Further, by flattening the top of the bent convex portion 5 as shown in FIG. 3, it becomes easy to perform arc welding so that the weld toe portion 1a is located at the top.
- the lap fillet arc welded joint 1 includes, for example, an undercarriage component for an automobile such as a suspension arm 21 shown in FIG. 25 and the surface of the lower part 23 can be applied when arc welding is performed along the end of the upper part 25.
- an undercarriage component for an automobile such as a suspension arm 21 shown in FIG. 25 and the surface of the lower part 23 can be applied when arc welding is performed along the end of the upper part 25.
- the fatigue strength of the junction 27 of the upper part 25 and the lower part 23 becomes a problem, but two parts are joined by the lap fillet arc welding joint 1 according to the present invention. By doing so, the fatigue strength can be improved.
- the lap fillet arc welded joint 31 has an end portion of the vertical wall portion 9a of one plate (upper component 9) and a vertical wall portion of the other plate (lower component 3).
- the welding toe part 1c is located in the inclined surface part 7 of the bead-shaped bending convex part 5 by the side welded with the edge part of the upper part 9.
- the overlapped fillet arc welded joint 31 projects in parallel to the end of the vertical wall 9a of the upper part 9 and to the surface side of the vertical wall 3a of the lower part 3 to be welded to the end.
- the bead-shaped bent convex part 5 is formed.
- the bent part 5 is provided on the lower part 3, and the end part of the upper part 9 and the inclined surface part 7 of the bent part 5 of the lower part 3 are arc-welded.
- the reason why the fatigue strength of the lap fillet arc welded joint 31 is improved will be described with reference to FIG.
- the weld toe portion 31a on the lower part 3 side where the bent convex portion 5 is formed is on the side of the bent convex portion 5 to be welded.
- Located on the inclined surface portion 7. Such a shape can be regarded as a member having a notch in the plate width direction, and it is necessary to consider a stress concentration factor when stress concentrates on the notch.
- This stress concentration factor Kt is calculated by the following equation (2).
- ⁇ is the flank angle
- ⁇ is the radius of curvature
- t1 is the thickness of the lower part 3
- t2 is the thickness of the upper part 9
- h is The weld bead height. From equation (2), it can be seen that when the weld bead height h is small, the stress concentration coefficient Kt is small, and the stress concentration is relaxed.
- the shape of the molten metal affects the shape after melting and solidification. Therefore, as compared with the conventional lap fillet arc welded joint 11 as shown in FIG. 2A, the lap corner according to the present invention in which the weld toe portion 31a is located on the inclined surface portion 7 as shown in FIG.
- the meat arc welded joint 31 clearly has a small weld bead height h. Therefore, the lap fillet arc welded joint 31 according to the present invention has a stress concentration factor Kt smaller than that of the conventional lap fillet arc welded joint 11, and the stress concentration is relaxed, thereby improving the fatigue strength.
- the parts to be welded are the end of the vertical wall portion 9 a of the upper part 9 and the surface of the vertical wall part 13 a of the lower part 13. It is the center (corner part) of the right-angled part where and intersect. Therefore, the weld toe part 11a and the weld toe part 11b are the intersections of the molten metal and the surface of the lower part 13 and the intersections of the molten metal and the surface of the upper part 9, respectively.
- the molten metal becomes easy to flow on the surface of the lower part 13 due to the action of gravity, and the wettability of the molten metal changes if there are slight variations in the welding conditions and the state of the metal plate surface. , Welding unevenness is likely to occur.
- one weld toe 31 a is located on the inclined surface portion 7 of the lower part 3, and the other weld toe 31 b is the surface of the upper part 9. Therefore, a groove shape is formed by the inclined surface part 7 of the lower part 3 and the end part of the upper part 9. And since arc welding is performed along this groove shape, even if there is some variation in the welding conditions and the condition of the metal plate surface, gravity acts on the molten metal and equalizes the welding unevenness on the molten metal itself. The action to work. Therefore, in the lap fillet arc welded joint 31 according to the present invention, uneven welding is less likely to occur and stable welding is possible, resulting in improved fatigue strength. Note that, as shown in FIG. 2 (b), the same applies to the case where the weld toe 1a is located at the top of the bent convex portion 5 according to the present invention, and uneven welding is less likely to occur and stable welding is possible. is there.
- the conventional lap fillet arc welded joint 11 (see FIG. 2 (a)) and the lap fillet arc welded joint 31 (see FIG. 2 (b) and FIG. 6) of the present invention which is welded by providing the inclined surface portion 7 are provided.
- the one weld toe portion 11b or the weld toe portion 31b is an intersection of the molten metal and the metal plate surface of the upper part 9, and both are in the same position.
- the other weld toe 11a is the surface of the lower part 3 (see FIG. 2 (a)). Therefore, in the conventional lap fillet welding, the propagation direction of the crack is substantially perpendicular to the surface of the lower part 3, and the propagation direction of the crack is parallel to the direction of repeated stress of fatigue (the surface of the lower part 3 is parallel). The propagation length of the crack (propagation length) is shortened.
- the lap fillet arc welded joint 31 of the present invention Compared to this, in the lap fillet arc welded joint 31 of the present invention, there is an inclined surface portion 7 on the surface of the lower part 3 (see FIG. 2 (b) and FIG. 6), which is almost the same as the plate thickness direction of the upper part 9. A crack propagates in parallel. Therefore, in the lap fillet arc welded joint 31, the crack propagates obliquely with respect to the plate thickness direction on the inclined surface portion 7, so that the propagation length is longer than that of the conventional lap fillet arc welded joint 11. As a result, the lap fillet arc welded joint 31 of the present invention has a longer fatigue life than the conventional lap fillet arc welded joint 11.
- the end portion of the vertical wall portion of the upper part 25 in the joined part in which the overlap part is provided and the two parts are fitted and arc-welded.
- the fatigue test piece was prepared according to the following procedure using a 780 MPa class hot rolled steel sheet having a thickness t of 2.6 mm as a test material. First, a plurality of steel plate pieces having dimensions of 300 mm ⁇ 100 mm were cut out from the test material. And the bead-shaped bending convex part 5 was formed in parallel with the edge part of the long side (300mm) of the cut-out steel plate piece.
- the cut steel plate piece 43 and the steel plate piece 45 formed with the bent convex portion 5 are overlapped and arc-welded along the end portion of the steel plate piece 43, thereby achieving the present invention.
- the test body joined by the lap fillet arc welding joint 1 (refer FIG.2 (b)) was produced.
- the fatigue test piece 41 of the shape shown in FIG. 8 was extract
- the welding conditions were a welding current of 180 A, a voltage of 22.5 V, a torch speed of 80 cm / min, a shielding gas of Ar-20% CO 2 , and a welding wire with a diameter of 1.2 mm, 780 MPa class high strength steel (high- strength steel) was used.
- the fatigue test was performed by pulsating plane bending, and the fatigue test piece 41 was placed in a testing machine so that the weld bead faced downward.
- the upper plate was fixed to the drive arm side of the testing machine
- the lower plate was fixed to the measurement swing arm side of the testing machine
- the fatigue test piece 41 was installed so that the center of the thickness of the lower plate was a bending neutral surface.
- the load was repeatedly applied so that the target stress was applied to the fatigue test piece 41 through the drive arm, and the test was performed until the fatigue test piece 41 was cracked.
- the stress applied to the fatigue test piece 41 was obtained from the moment measured through the measurement swing arm, the plate thickness and the plate width of the fatigue test piece 41 (average value of the upper plate and the lower plate).
- the fatigue test conditions were a stress ratio of 0 (one swing), a test frequency of 20 Hz, and the fatigue test was terminated at the maximum of 10 million times.
- Example 1 the fatigue strength of the lap fillet arc welded joint 1 was examined by changing the shape of the bent convex portion 5 shown in FIG.
- the shape of the bent convex portion 5 is such that the height of the bent convex portion 5 is h1, the curvature radius of the rising portion 5a on the side not bent in the bent convex portion 5 is ⁇ 1, and the height of the rising portion 5a.
- the rising angle was defined as ⁇ 1
- the radius of curvature of the apex on the non-welded side was defined as ⁇ 2
- the width between the R end portion of the apex and the rising portion 5a was defined as Wp
- the width of the bent convex portion 5 was defined as Wb.
- Table 1 shows the shape of the bead-shaped bent convex portion 5 formed by press molding.
- the comparative example (No. 10) in Table 1 is a fatigue test piece having a conventional lap fillet arc welded joint 11 as shown in FIG.
- FIG. 11 shows the test results of fatigue strength (stress amplitude) at 3 million cycles.
- the comparative example No. which is the conventional lap fillet arc welding joint 11 is shown.
- No. 10 which is an example of the present invention.
- 1-No. No. 9 resulted in improved fatigue strength.
- No. In Nos. 1, 2, 4, 5, and 6, No. In 3, 7, 8, and 9, fatigue cracks occurred in the rising portion 5a of the bent convex portion 5.
- No. 4 to No. 6 shows that the radius of curvature ⁇ 1 at the rising portion 5a is No.6.
- ⁇ 1 0.8 mm.
- the rising angle ⁇ 1 of the rising part 5a in the bent convex part 5 is different.
- No. 7 and No. 7 are different from each other in the curvature radius ⁇ 2 of the apex on the non-welded side.
- No. 8 since the fatigue crack was generated at the rising portion 5a of the bent convex portion 5, both exhibited good fatigue strength.
- Example 2 a basic fatigue test was performed using a fatigue test piece joined by the lap fillet arc welded joint 31 according to the present invention shown in FIG. 12 (a), and the fatigue characteristics were evaluated.
- the fatigue test piece joined by the lap fillet arc welded joint 31 according to the present invention is a 780 MPa class hot rolled steel sheet having a thickness t of 2.6 mm as in the case of Example 1, and the following procedure is used.
- FIG. 12 shows a fatigue test piece of the present invention example (see FIG. 12A) and a cross-sectional view in the vicinity of the weld bead in the fatigue test piece of the comparative example (see FIG. 12B).
- the height (depth) D of the inclined surface portion 7 provided by the formed bent convex portion 5 is equal to the plate thickness t2 of the test material.
- the inclination angle ⁇ of the inclined surface portion 7 formed by the bent convex portion 5 is 45 °
- the distance L1 between the end of the steel plate piece 43 and the rising portion 5a of the bent convex portion 5 of the steel plate piece 45 is 2 mm
- the overlap margin L2 of the steel plate piece 43 and the steel plate piece 45 was 5 mm.
- the overlap margin L2 of the steel plate piece 43 and the steel plate piece 45 was 5 mm.
- the weld bead width W was set to 5.5 mm or 7 mm so as to be the same in the present invention example and the comparative example.
- the arc welding conditions are set such that the welding current is 185 A or 205 A, the voltage is 19 V or 23 V, the welding speed is 85 cm / min, the shielding gas is Ar-20% CO 2 , the welding wire 780 MPa class high strength steel having a diameter of 1.2 mm was used.
- Table 2 shows the arc welding conditions.
- the fatigue test was performed by single swing plane bending in the same manner as in Example 1, and was installed in the testing machine so that the weld bead of the fatigue test piece was directed downward.
- the upper plate was fixed to the drive arm side of the testing machine
- the lower plate was fixed to the measurement swing arm side of the testing machine
- the fatigue test piece 41 was installed so that the center of the thickness of the lower plate was a bending neutral surface.
- a repeated load was applied so that the target stress was applied to the fatigue test piece 41 through the drive arm, and the test was performed until the fatigue test piece 41 cracked (see FIG. 9).
- the stress applied to the fatigue test piece 41 was determined from the moment measured through the measurement swing arm and the plate thickness and plate width (average value of the upper plate and the lower plate) of the fatigue test piece 41.
- the fatigue test conditions were a stress ratio of 0 (one swing), a test frequency of 20 Hz, and the fatigue test was terminated at a maximum of 10 million times.
- the fatigue test results are shown in Table 2 above.
- the example of the present invention is a test result of the fatigue test piece joined by the lap fillet arc welded joint having the weld toe portion on the inclined surface portion shown in FIG.
- a comparative example is the test result of the fatigue test piece joined by the lap fillet arc welding joint of the prior art shown in FIG.12 (b). From Table 2, when compared with each target stress, the inventive example greatly exceeded the fatigue life of the comparative example regardless of welding conditions.
- the present invention can be applied to a lap fillet arc welded joint because it can improve the fatigue strength of the joined parts joined by the lap fillet arc welded joint.
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Abstract
Description
以下、本発明の一実施の形態に係る重ね隅肉アーク溶接継手について、具体的に説明する。本発明に係る重ね隅肉アーク溶接継手1は、図1に示すように、2枚の板を重ねて、一方の板(上側部品9の縦壁部(side wall portion)9a)の端部と他方の部品(下側部品3の縦壁部3a)の表面とを、上側部品9の端部に沿って接合するに際し、ビード状の屈曲凸部5の頂上部に溶接止端部1aが位置するように、アーク溶接にて線状に接合したものである。すなわち、重ね隅肉アーク溶接継手1には、上側部品9の縦壁部9aの端部に並行し、かつ当該端部と溶接される下側部品3の縦壁部3aの表面側に突出するように、ビード状の屈曲凸部5が形成されている。
以下、本発明の他の実施の形態に係る重ね隅肉アーク溶接継手について、図5及び図6に基づいて具体的に説明する。なお、図5及び図6において、図1又は図2と同一又は対応する部分には同一の符号を付してある。
1a 溶接止端部(下側部品側)
1b 溶接止端部(上側部品側)
3 下側部品
3a 縦壁部
5 屈曲凸部
5a 立ち上がり部
9 上側部品
9a 縦壁部
11 重ね隅肉アーク溶接継手
11a 溶接止端部(下側部品側)
11b 溶接止端部(上側部品側)
13 下側部品
13a 縦壁部
21 サスペンションアーム
23 下側部品
25 上側部品
27 接合部
31 重ね隅肉アーク溶接継手
31a 溶接止端部
31b 溶接止端部
41 疲労試験片
43 鋼板片
45 鋼板片
Claims (4)
- 2枚の板を重ねて、一方の板の端部と他方の板の表面を前記一方の板の端部に沿って溶接した重ね隅肉アーク溶接継手であって、
前記他方の板の表面側に突出したビード状の屈曲凸部を設け、該屈曲凸部の頂上部に溶接止端部が位置することを特徴とする重ね隅肉アーク溶接継手。 - 前記頂上部が平坦であることを特徴とする請求項1に記載の重ね隅肉アーク溶接継手。
- 前記屈曲凸部の溶接していない側における前記屈曲凸部の立ち上がり部の曲率半径が0.8mm以上であることを特徴とする請求項1又は2記載の重ね隅肉アーク溶接継手。
- 2枚の板を重ねて、一方の板の端部と他方の板の表面を前記一方の板の端部に沿って溶接した重ね隅肉アーク溶接継手であって、
前記他方の板の表面側に突出したビード状の屈曲凸部を設け、該屈曲凸部の傾斜面部のうち、前記一方の板の端部と溶接される側の前記傾斜面部に溶接止端部が位置することを特徴とする重ね隅肉アーク溶接継手。
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US15/547,256 US10590974B2 (en) | 2015-02-12 | 2016-01-27 | Lap fillet arc-welded joint |
EP16749033.3A EP3257612B1 (en) | 2015-02-12 | 2016-01-27 | Lap fillet arc-welded joint |
MX2017010264A MX2017010264A (es) | 2015-02-12 | 2016-01-27 | Union traslapada soldada por arco en angulo. |
CN201680009319.8A CN107206525B (zh) | 2015-02-12 | 2016-01-27 | 搭接角焊电弧焊接头 |
KR1020177024018A KR101973308B1 (ko) | 2015-02-12 | 2016-01-27 | 랩 필릿 아크 용접 이음매 |
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JP2015025551A JP5994879B2 (ja) | 2015-02-12 | 2015-02-12 | 重ね隅肉アーク溶接継手 |
JP2015-025551 | 2015-02-12 |
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JP6114785B2 (ja) * | 2015-05-29 | 2017-04-12 | 日新製鋼株式会社 | 溶接部外観と溶接強度に優れた溶融Zn系めっき鋼板のアーク溶接方法、および溶接部材の製造方法 |
JP6065147B1 (ja) * | 2015-10-26 | 2017-01-25 | Jfeスチール株式会社 | 重ね隅肉アーク溶接継手、プレス成形部品の接合構造 |
KR101876079B1 (ko) * | 2016-11-17 | 2018-07-06 | 현대자동차주식회사 | 하프셀 결합구조 및 이를 포함하는 배기매니폴드, 하프셀 조인트방법 |
KR102266643B1 (ko) * | 2017-02-28 | 2021-06-17 | 제이에프이 스틸 가부시키가이샤 | 겹치기 필렛 아크 용접 이음매 및 그 제조 방법 |
KR20210122408A (ko) | 2020-03-31 | 2021-10-12 | 현대자동차주식회사 | T형 용접 이음매의 접합 구조 |
KR20210156987A (ko) * | 2020-06-19 | 2021-12-28 | 현대자동차주식회사 | 모재에 형상을 부여하는 방식의 용접 방법 및 이를 위한 모재 |
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- 2016-01-27 WO PCT/JP2016/052254 patent/WO2016129388A1/ja active Application Filing
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US10590974B2 (en) | 2020-03-17 |
JP2016147288A (ja) | 2016-08-18 |
CN107206525A (zh) | 2017-09-26 |
KR20170105116A (ko) | 2017-09-18 |
EP3257612B1 (en) | 2019-09-04 |
EP3257612A1 (en) | 2017-12-20 |
KR101973308B1 (ko) | 2019-04-26 |
US20180274575A1 (en) | 2018-09-27 |
CN107206525B (zh) | 2019-06-25 |
JP5994879B2 (ja) | 2016-09-21 |
EP3257612A4 (en) | 2018-08-29 |
MX2017010264A (es) | 2017-11-17 |
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