JPH0471634B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention is a method for butt-welding the ends of thin aluminum plates made of pure aluminum or aluminum alloy using a fusion welding method such as inert gas arc welding, electron beam welding, or laser welding. It's about how to do it.

Conventional technology Conventionally, in butt fusion welding of aluminum thin plates, the lower limit of the weldable plate thickness was around 1 mm, but recent advances in welding equipment have made it possible to weld thinner plates. , recently, 0.6
Depending on the conditions, it is possible to weld up to a plate thickness of approximately 0.2 mm. Therefore, recently, butt fusion welding has been applied to the production of thin aluminum sheet products with a thickness of about 1 mm or less, such as thin-walled cylinders and thin-walled boxes and containers, and also in the production of long coils of thin aluminum sheets with a thickness of about 1 mm or less. Butt fusion welding is increasingly being applied to joins.

Problems to be Solved by the Invention However, in welding such thin plates, new problems have arisen that did not pose much of a problem in conventional welding of relatively thick plates. As one example, in butt fusion welding of thin plates, as shown in FIG.
When the ends of the plates 2 and 2 are butted together and melt welded, the molten metal is drawn into a concave curve due to surface tension at the widthwise ends of the plates, that is, at both ends of the weld bead, and as a result, depressions 4 are created at both ends of the butt weld bead 3. There is a problem.

If such depressions occur at both ends of the board in the width direction,
Depending on the use of the welded product, its function may be impaired, or even if the function is not impaired, the product value may be reduced due to poor appearance. Therefore, such recessed parts are often removed after welding, but in this case, it becomes necessary to cut off both widthwise edges along the entire length of the product with a width corresponding to the recess depth d.
For example, when welding a coil joint, it becomes necessary to cut off both edges in the width direction over the entire length of the coil, resulting in an unavoidable problem of extremely low material yield. In addition, there is a problem in that a large-scale cutting device is required to cut off the entire length of the coil in this manner. Furthermore, in the case of cylindrical welded products or other products with complex shapes, it is difficult to accurately cut both edges in the width direction along the entire length of the product because the plate itself is thin and has low rigidity. In addition, depending on the shape of the product, it is often difficult to cut the product in a straight line.

On the other hand, in normal butt welding between flat plates,
Generally, as shown in Fig. 9, after aligning the grooves at the ends of the plates 1 and 2 to be welded, end tabs 5 and 6 are placed on both sides of the groove positions and temporarily fixed by tack welding or the like. This method has been used to perform regular welding, and it is also being considered to apply this method to butt welding of thin plates to prevent the occurrence of dents as described above, but even if end tabs are provided in this way, For thin plates, weld bead 3 as shown in Figure 9.
During fusion welding, the same molten metal shrinks as described above at the boundary between the base metal thin plates 1, 2 and the end tabs 5, 6 in the middle, and that part becomes the through hole 8. After the end tab is cut and removed, the through hole 8 part becomes the through hole 8. It remains as a depression similar to the above.

Further, as a method related to the above-mentioned method shown in FIG. 9, methods shown in FIGS. 10A to 10D are proposed in Japanese Patent Application Laid-Open No. 59-13590. In this proposed method, first, as shown in FIG. 10A, end tabs 5, 5', 6, and 6' are placed on both sides near the ends of the plates 1 and 2 to be welded, and the fillet Each end tab 5, 5', 6, 6' is fixed to the plate 1, 2 by a local tack weld 9, such as a weld, and then as shown by the dashed lines 10, 10' in Figure 10A. A bevel is formed by cutting parallel to the width direction of the plates 1 and 2 at positions across the tabs 5, 5', 6, and 6', and then the first groove is cut.
0 As shown in Figure B, butt plates 1 and 2 together and
Perform the main welding as shown in Figure 0C, and then perform the first welding.
As shown in Figure 0D, the tabs 5, 5', 6, remaining on both sides
6' is cut off. Even with this method,
During the main welding shown in FIG. 10C, plates 1 and 2 and tabs 5, 5', 6,
At the boundary with 6', the molten metal is drawn toward the plates 1 and 2, and the molten metal is drawn toward the tabs 5, 5', 6, and 6', and that portion becomes the through hole 8. After the end tabs 5, 5', 6, 6' are removed, the portion of the through hole 8 remains as a depression 4 as shown in FIG. 10D.

As mentioned above, in the butt welding of thin aluminum plates using the fusion welding method, it is impossible to avoid the occurrence of depressions at both ends of the weld bead, and even when attempting to remove the depressions, there are various problems such as a decrease in yield. This was causing problems.

The present invention was made against the background of the above-mentioned circumstances, and an object of the present invention is to provide a method for butt welding thin aluminum plates by fusion welding, in which depressions are not formed at both ends of the weld bead. It is.

Means for Solving the Problems As a result of repeated studies to achieve the above-mentioned objective, the present inventors have actively utilized the tack welded portion with the end tab as part of the groove portion during butt fusion welding. It has been found that by doing so, it is possible to prevent the occurrence of depressions as described above.
In other words, in the conventional butt fusion welding of thin aluminum sheets, depressions occur at both ends of the weld bead because those areas are open ends. Normally, the end tab and base metal are not completely integrated at the groove part,
It was impossible to avoid the occurrence of a depression similar to that in the case of an open end. Focusing on this point, in the present invention, during actual welding, the butt groove part is continuously integrated from the base metal thin plate to the end tab. This was done to prevent the formation of dents.

Specifically, the present invention provides a method for butt-welding the ends of thin aluminum plates to each other by fusion welding, in which end tabs made of thin aluminum plates are placed on both sides in the width direction of the ends of the thin base metal plate to be butt-welded. The weld bead is perpendicular to the width direction of the base metal thin plate by arranging the surface so that it is substantially flush with the base metal thin plate, and by fusion welding the end tab and the end side edge of the base metal thin plate. The process of continuous tack welding along the direction, and after tack welding, the tip of the base metal thin plate is The process of cutting a predetermined width part and the end tab part on its extension in a straight line along the width direction of the base material thin plate and forming a bevel, and after the beveling process, the beveled part is butted. hand,
A process of main welding by fusion welding from the butt part of one end tab through the butt part of the thin base metal plate to the butt part of the other end tab, and after the main welding, cutting the end tab from the thin base metal plate. It is characterized by comprising a step of removing.

Here, as aspects of the method of the present invention, there are an aspect using a pair of end tabs and an aspect using two pairs of end tabs. In other words, in the former case where a pair of end tabs are used, when placing the end tabs on both sides of the thin base plate end, the ends of the base metal thin plate to be welded are butted against each other, and each end tab is placed on one side of the base metal. It is arranged so as to extend from the side edge of the thin plate to the side edge of the base metal thin plate on the other side, and tack welding is performed so as to form a continuous bead across the butt portion of the base metals. In addition, in the latter embodiment using two pairs of end tabs, each end tab is placed independently on each side edge of the end of the thin base material, and the leading edge thereof is substantially on the same straight line as the leading edge of the end of the thin base material. Then, tack welding is performed so that the weld bead continues to the vicinity of the tip of the base metal thin plate.

Functions Each embodiment of the present invention will be described below based on the drawings, and the functions of the present invention will be explained.

Figures 1 to 5 show a pair of end tabs 13, 14.
In this embodiment, first, as shown in FIG.
Butt the ends of the base material thin plate 11,
End tabs 13 and 14 made of thin aluminum plates are arranged on both sides in the width direction of the abutting portions of the ends of the ends. At this time, the end tabs 13 and 14 are connected to the side edges 11A and 11 of the end of the base material thin plate 11 on one side.
Side edge 12 of the end of the base material thin plate 12 on the other side from B
It is arranged so as to span A and 12B. Further, the end tabs 13 and 14 are arranged so that their surfaces are substantially flush with the surfaces of the thin base plates 11 and 12.
Usually, the thickness is the same as that of the base material thin plates 11 and 12.

Then, as shown in FIG. 2, the end tab 13,
14 side edge and base material thin plates 11 and 12 in contact with it
The side edges of the ends are tack-welded by fusion welding. This tack welding is performed so that the weld beads 15 and 16 are continuous along a direction perpendicular to the width direction of the thin base plates 11 and 12. Therefore, in this embodiment, the weld beads 15, 16 are continuous across the abutting position of the ends of the base metal sheets 11, 12.

In such tack welding, weld bead 1
Normally, through holes 17 and 18 are formed in the weld beads 15 and 16 at the portions 5 and 16 that cross the abutting positions of the thin base plate ends. In other words, as explained in the prior art, since the butt parts of the thin base plate ends are not integrated with each other, the surface tension of the molten metal during fusion welding causes the molten metal to dent toward each base metal thin plate, resulting in penetration. This results in the formation of holes 17 and 18.

After tack welding, as shown in FIGS. 2 and 3, end tabs are formed at the tips of the thin base metal plates 11 and 12 with a predetermined width w and on the extension thereof, so as to cross the tack weld beads 15 and 16. The parts 13 and 14 are cut off in a straight line along the width direction of the base material thin plates 11 and 12 (the cutting positions are shown as 21 and 2 in Fig. 2).
2), groove portions 19 and 20 are formed from the end tab 13 on one side to the end tab 14 on the other side via the base material thin plates 11 and 12. The width w to be cut off in this beveling process (2 x w considering the base metal thin plates on both sides) is the weld bead 1 as described above.
The portions of the through holes 17 and 18 at the abutting positions of the base material thin plate ends 5 and 16 are determined so that they are completely cut off. Furthermore, the cutting positions 21 and 22 of the groove processing (therefore, the positions of the groove parts 19 and 20 after cutting) are the welding start end 15 of the tack welding beads 15 and 16.
A, 16A and welding ends 15B, 16B are not included.

By cutting the bevel in this manner, not only the base metal thin plates 11 and 12 but also the end tabs 13 and 14 on both sides and the tack welding bead 15,
Grooves 19 and 20 will be formed including the portions 16, and the base material thin plates 11 and 12 appearing in the grooves 19 and 20 and the end tab 1 will be formed.
Tack welding bead 15, 1 at the boundary position with 3, 14
The part 6 is a sound welded part with no defects. In other words, the welding starting ends 15A, 16A and the welding end 15
Although defects are likely to occur in B and 16B, grooves 19 and 20 are formed by cutting the welds avoiding the welding start and end ends, and the through hole 17 is cut by cutting at a certain width w as described above. , 18 have also been removed, so that a sound tack weld is present in the groove 1.
9 and 20, and the base metal thin plates 11 and 12 and the end tab 1 are connected by the sound tack welded parts.
3 and 14 are completely continuous and integrated.

Next, the groove parts 19 and 20 including the end tabs 13 and 14 are butted together, and as shown in FIG.
1 and 12 and then the other end tab 14
Main welding is performed by fusion welding up to the groove part. In this main welding, the weld bead 23 extends from one end tab 13 to the other end tab 14, and has a welding start end 23A and a welding end 23B.
are located within the end tabs 13 and 14, respectively.
In other words, the welding start end 23A where defects are likely to occur;
The terminal end 23B does not exist in the welded portion between the base metal thin plates 11 and 12. And base material thin plate 11,1
2 and the end tabs 13 and 14, as already mentioned, are completely continuous and integrated in advance by a sound tack weld, so defects such as depressions and through holes may occur at the boundaries during actual welding. do not have.

After the main welding including the end tabs 13 and 14 as described above, the end tabs 13 and 14 are cut and removed from the base metal thin plates 11 and 12, thereby completing each step of the present invention. A butt-welded material of base material thin plates 11 and 12 as shown in the figure is obtained. Note that after the end tabs 13 and 14 are cut and removed, the cut portions may be appropriately finished.

In the aluminum thin plate welded product finally obtained in this manner, as is clear from FIG. 5, there are no defects such as depressions at both ends of the weld bead 23.

In FIGS. 6 and 7, two pairs of end tabs 13, 1 are shown.
Another embodiment of this invention using 3', 14, 14' is shown. In this case, first of all, as shown in FIG.
4' are arranged independently. At this time, the base material thin plate 11,
12 tip position and each end tab 13, 13', 1
4 and 14' are positioned so that they are substantially aligned.

Then, as shown in FIG.
3, 13', 14, 14' and the end side edges of the base metal thin plates 11, 12 are tack-welded by fusion welding. This tack welding is performed at each tack weld bead 15, 1.
5', 16, 16' are continuous in the direction perpendicular to the width direction of the base metal thin plates 11, 12, and the tack welding beads 15, 15', 16, 16' are connected to the base metal thin plates 1.
Continue until the tip positions 1 and 12 are reached or close to them.

In such tack welding, each tack weld bead 15, 15',
Normally, a depression 24 is formed at the tip of each of the thin plates 16 and 16' (the end on the side of the tip of the thin base plate).
However, since the portion where the depression 24 is formed will be cut off in the next beveling process, the presence of the depression 24 will not have any adverse effect. That is, after tack welding, the tack weld beads 15, 15',
16, 16', the base material thin plates 11,
A portion of a predetermined width w at the tip of 12 and an end tab portion on its extension along the width direction of the base material thin plates 11 and 12 (that is, along the cutting positions 21 and 22).
Cut off and prepare a bevel including the end tab part, but the width w to be cut off is the same as the recess 2 at the end of 15, 15', 16, 16' as described above.
Set so that part 4 is completely removed. Note that the cutting positions 21 and 22 are at the tack welding beads 15 and 1.
Weld start ends 15A, 15 at 5', 16, 16'
Not including the portions A', 16A, and 16A' is the same as in the case already described. By performing the bevel processing in this manner, healthy portions of the tacking beads 15, 15', 16, 16' appear in the beveling portion.

After the beveling process is performed by cutting off the width w in this way, the end tabs 13, 13',
14 and 14', and the end tabs 14, 14, 14, 14,
Main welding is performed by fusion welding up to the butt part of 14', and then the end tabs 13, 13', 14,
14' is cut and removed. The welded product finally obtained in this manner has no depressions at either end of the weld bead 23, as in the case shown in FIG.

As described above, in the method of the present invention, by performing predetermined groove processing after tack welding the end tabs, the boundary between the base metal thin plate and the end tabs is maintained at the groove by a sound tack weld. They are completely continuous and integrated, so when the final weld is performed including the end tab, defects such as dents and through holes do not occur at the boundary, and it is possible to ultimately cut and remove the end tab after the final weld. , it is possible to obtain a welded part without defects such as depressions at both ends.

As described above, the method of the present invention is characterized in that the tack welding of the end tabs is actively utilized and the tack welded portion with the end tabs is introduced into a part of the groove. In conventional general welding, even if tack welding was performed at the groove, it was common sense to remove this tack welding during actual welding, but in this invention, the tack welding is rather removed at the groove. This means that additional welding is actively utilized.

In general, tack welding is said to be prone to defects due to the shallow penetration and the fact that the weld bead is usually short and the weld start and end are adjacent to each other, but the method of this invention Since the target is thin plates, during tack welding, the back side of the plate can be easily melted in one pass, and sufficient penetration can be obtained for the plate thickness, and the groove part in main welding can be easily melted. Since the weld start and end of the tack weld are not included in the groove by groove processing, defects at the start and end of the tack weld do not pose a problem.

Note that the material of the aluminum thin plate to which the method of this invention is applied is not particularly limited, and generally weldable materials such as JIS A1100 alloy, A5052
Can be applied to alloy, A5083 alloy, A6061 alloy, etc. The end tabs may be made of the same or similar aluminum material as the thin base plate. Furthermore, the thickness of the applied base material thin plate is 0.1
-2 mm, preferably 0.2-1 mm. The fusion welding method used in the method of the invention is as follows:
Inert gas arc welding (TIG or MIG)
etc.) are typical, but other methods such as electron beam welding and laser welding can also be used.

Examples Example 1 An example will be described in which the method of the present invention was carried out in the manner shown in FIGS. 1 to 5 using a pair of end tabs.

As the base material thin plates 11 and 12, 1.0 x 200 x 200 mm thin plates made of JIS A1100 alloy are used.As shown in Fig. 1, these base material thin plates 11 and 12 are butted, and a base material thin plate made of the same material as the base material thin plates is used. 1.0×100×100
End tabs 13 and 14 made of thin plates having a diameter of 1 mm were placed adjacent to both sides of the abutting portions of the thin base plates 11 and 12. Then, by TIG welding, the end tabs 13 and 14 were attached to the thin base metal plates 11 and 12 as shown in Fig. 2 using a welding current of 60 A, a welding speed of 40 cm/min, and an Ar flow rate of 10/min.
Tack weld bead 1 with a bead length of 90 mm.
5,16 were formed. Furthermore, base material thin plates 11 and 12
Shear cutting was performed at positions 21 and 22 parallel to the butt line and at a distance w of 10 mm from the butt line to form grooves 19 and 20 as shown in FIG.
Thereafter, the grooves 19 and 20 are butted together, and main welding is performed from near the outer end of the end tab 13 to near the outer end of the end tab 14 under the same conditions as above, as shown in FIG. Formed. Thereafter, the end tabs 13 and 14 were further cut and removed using a shear, and finally a butt-welded product of base metal thin plates 11 and 12 as shown in FIG. 5 was obtained.
This butt-welded product had no defects such as depressions on both sides of the weld bead, and had a sound weld.

Example 2 Using two pairs of end tabs in Figure 6~
An example in which the method of the present invention was implemented in the manner shown in FIG. 7 will be described.

The same thin base plates 11 and 12 as in Example 1 were used, and the end tabs 13, 13', 14,
14' is 1.0 made of the same material as the base material thin plates 11 and 12.
x 60 x 60 mm, arranged as shown in Figure 6, and end tabs 13, 1 as shown in Figure 7.
4 was tack welded to the base metal thin plate 11, and the end tabs 13' and 14' were tack welded to the base metal thin plate 12 to form tack weld beads 15, 15', 16, and 16'. The conditions for tack welding are the same as in Example 1. Next, position 2 where the width w from the board edge is 15mm
No. 1 and 22 were cut with a shear to form a groove. Thereafter, main welding was performed in the same manner as in Example 1, and further welding end tabs 13, 13',
14 and 14' were cut with a shear to obtain a butt-welded product similar to that shown in FIG. This butt-welded material product also had no defects such as depressions at both ends of the weld bead, and had a sound welded part.

Effects of the Invention As is clear from the above embodiments, according to the method of the present invention, in butt welding of thin aluminum plates by fusion welding, a sound state is achieved without causing defects such as depressions at both ends of the weld bead. Welds can be obtained. Therefore, the aluminum thin plate welded product obtained by the method of the present invention is free from the risk of impairing the function of the product or causing poor appearance due to the above-mentioned depressions at both ends of the weld bead. Since there is no need to remove the recessed portions at both ends, it is possible to prevent a decrease in material yield, especially when welding long coils.

[Brief explanation of drawings]

FIGS. 1 to 5 are plan views step by step showing one embodiment of the invention using a pair of end tabs, and FIGS. 6 and 7 are plan views showing another embodiment of the invention using two pairs of end tabs. FIG. 8 is a plan view showing conventional butt fusion welding of aluminum thin plates; FIG. 9 is a plan view showing an example of butt fusion welding using conventional end tabs;
0A to 0D are plan views showing step by step another example of butt fusion welding using conventional end tabs. 11, 12... Base material thin plate, 13, 13', 14,
14'...End tab, 15, 15', 16, 1
6'...Weld bead in tack welding, 15A,
16A, 15A', 16A'...Welding start end, 15B,
16B, 15B', 16B'...Welding end, 19,
20...Bevel part, 21, 22...Cutting position, 23
...Weld bead in main welding.

[Claims]

1 A laminated material of titanium-based metal, a low carbon steel plate with a carbon content of 0.01% by weight or less bonded to the laminated material, a nickel plate bonded to the low carbon steel plate, and a base bonded to the nickel plate. Titanium-based metal clad steel made of steel plate. 2. In a method of manufacturing clad steel by laminating a titanium-based metal laminate and a base steel plate and hot rolling, the carbon content on the laminate side between both members is 0.01.
A low carbon steel plate with a weight percentage of less than After this, at least the bonding surface between the titanium-based metal laminate and the low carbon steel sheet is degassed to a vacuum of 10 ^-1 Torr or less, and the rolling start temperature is 500°C or higher.
A method for manufacturing titanium-based metal clad steel, which is characterized by roll rolling at a temperature of 1050℃ or less.

Claims (1)

Law. 2 A pair of end tabs are used as the end tabs, and the process of arranging the end tabs on both sides of the end of the thin base material plate is performed by placing the end tabs on both sides of the butted portion with the ends of the thin base material plate to be welded abutting each other. The process of arranging the end tabs so that they span from the side edge of one base metal thin plate end to the side edge of the other base metal thin plate end, and the process of tack welding the end tabs is a process in which the weld bead is aligned with the base metal thin plate end. 2. The method of butt welding aluminum thin plates according to claim 1, wherein the process involves welding continuously across the butt positions of the ends of the thin plates. 3 Two pairs of end tabs are used, and the process of arranging the end tabs on both sides of the end of the thin base plate is such that each end tab is placed on the side edge of the thin base plate, and the tip of each end tab is placed on the side edge of the thin base plate. The process of arranging the end tab so that it is located substantially on the extension line of the tip of the base metal thin plate, and the process of tack welding the end tab is the process of welding so that the weld bead continues to the vicinity of the tip of the base metal thin plate. A method for butt welding thin aluminum plates according to claim 1.