Classifications

• • 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
  • B23K11/00—Resistance welding; Severing by resistance heating
  • B23K11/08—Seam welding not restricted to one of the preceding subgroups
• • 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
  • B23K11/00—Resistance welding; Severing by resistance heating
  • B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
  • B23K11/061—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams
  • B23K11/062—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams for welding longitudinal seams of tubes
  • B23K11/063—Lap welding
• • 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
  • B23K11/00—Resistance welding; Severing by resistance heating
  • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
  • B23K11/163—Welding of coated materials

Definitions

• the present invention relates to a welding method in which an electric current range for welding is expanded in electric resistance seam welding of a can body using a difficult-to-weld material, for example, tenfly steel. It is a thing.
• the copper wire resistance seam welding method is used to connect the copper wires ( 2 ) wound around the upper and lower electrode electrodes ( 3 ).
• the longitudinal edge of the can body plate (1) which has been formed into a tubular shape in advance, is passed while being overlapped with a predetermined width, and the overlapping portion of the can body plate (1) is passed through the upper and lower roller electrodes (3).
• pressure and current are applied via the copper wire (2), and welding is performed continuously for 1 to 1 due to electric resistance heat generated at the overlapped portion.
• the vertical edge of the can body (1) is connected to the guide groove using a Z-shaped guide bar ( 4 ). ⁇ People are superimposed on each other. This overlapping width is determined by the Z-shaped guide bar (4) where the vertical portions are overlapped, and the can body diameter determining hole disposed around the upper and lower electrodes (electrodes). ? It is determined .
• the quality of the welds depends on the joint strength, airtightness and It is evaluated based on the appearance properties. Bonding strength and airtightness are problems related to leakage of the contents.To satisfy these characteristics, it is necessary that the heat generated by electric resistance at the bonding interface exceeds a certain limit. . From this, the minimum value of the welding current is determined. In addition, it is necessary that burrs exist as the appearance properties. Normally, after welding, the seam weld is covered with a protective paint.However, the presence of burrs can cause problems with paint application, 3 ⁇ 4D, and exposed parts that are not covered with paint.
• the contents do not react with the burrs and change quality, and the burrs may peel off from the can body and be mixed into the contents. .
• the burrs molten metal scattered from the seam weld and adhered near the seam weld.
• the heat generated at the junction interface it is necessary that the heat generated at the junction interface be below a certain limit. From this, the maximum value of the welding current is determined.
• the proper current value range for welding is a range where the value obtained by subtracting the lower limit current value from the upper limit current value is a positive value i, and the quality of the weldability of the container material depends on the width of this proper current value range. Is determined.
• the steel material for containers used in this welding method is required to be excellent in various properties such as corrosion resistance, workability, paintability, etc. required for steel plates for containers, and also excellent in weldability.
• soldering cans titanium adhesion of 2.8 f / rri or more
• new materials steel materials
• soldering cans and thinner cans are obtained!
• the appropriate current value range is wide and the weldability is extremely good.
• a part of the thin solder and the tin-free steel have a narrower welding current range than the solder can and have poor weldability.
• Tin-free steel is liable to generate burrs during welding, and if the welding current is reduced to suppress the formation of pallets, the joint strength and adhesion will not be sufficient. You.
• the surface of the overlapped portion and the edge of the blank, which is to be overlapped is exposed beforehand by exposing almost the entire iron surface by mechanical means such as a zipper. Electric resistance seam welding was being performed.
• mechanical means increase the number of work steps, and further increase the number of work steps.9
• the fine powder removed is not completely removed from the steel sheet surface and reattached, causing various inconveniences in the subsequent steps.
• the exposed surface of the iron after removing the surface coating has disadvantages such as lack of corrosion and impaired appearance. For this reason, tin-free steel is still in use in canned food cans.
• the present invention solves the above-mentioned drawbacks, and performs any special pretreatment of a material for food containers, which is difficult to weld by electric resistance seam such as tin-free steel. Not easily It is intended to provide an electric resistance seam welding method that enables welding.
• the present invention relates to an electric resistance seam welding method for a hard-to-weld steel plate!
• the steel sheet has a coating layer of a metal and an intermetallic compound harder than tin as a coating layer, and the thickness of the steel sheet is in a range usually used as a material for cans, that is, 0.5 or less.
• the overlapping width of the steel sheet is more than 2.0 times the sheet thickness and less than 2.4 times.
• FIG. 1 is an illustration of the copper wire resistance seam welding method
• Fig. 2 is an illustration of the copper wire resistance seam welding method shown in Fig. 1
• Fig. 5 Fig. 4 is an explanatory view of the welding condition of the seam welded part of the tin free steel.
• Figs. 4 and 5 show the material plates for the tin free steel.
• FIG. 4 is a characteristic diagram showing a relationship between a ratio of a thickness to an overlap width and a welding current.
• (1) can body plate, (2) copper wire, (3) roller electrode, (4) Z-shaped guide bar, (5) ground iron part, (6) ...
• the hydrated oxide of the chemical conversion coating is an electrical insulator
• the tin on the base is soft and the electrode
• the chemical conversion coating easily breaks and disperses, and a large energized area can be obtained. Therefore, electric resistance heat is generated uniformly at the joint interface, and a high-temperature softening region is obtained in a sufficiently wide range while molten metal is generated.Pressure welding is performed at the joint interface due to large plastic flow. And a good seam is obtained.
• the tin free steel which has poor weldability, is located under the chemical conversion coating ( 7 ), as shown in the schematic diagram of the seam weld formation in Fig. 3. Since the metal cup (6) is extremely hard compared to tin, the chemical conversion coating is not sufficiently ruptured by pressurization of the electrode.9 The current flows locally and unevenly during welding. become . Therefore, the molten metal (9) is formed at a relatively low current value. However, since the high-temperature softening region is not sufficiently formed, and the effect of confining the molten metal by plastic flow is weak, the molten metal is easily scattered and the barrier (10) Will form. However, it became clear that the joint strength and airtightness could be obtained relatively easily even by local joining.
• the inventor of the present invention believes that it is effective to increase the force for suppressing the scattering of molten metal in order to improve the weldability of difficult-to-weld materials. Therefore, optimization of the seam welded shape (overlap width) was studied.
• the superposition width that has been used conventionally is more than a4, observation and 0.8 Nada!
• the weldability when using these overlapping widths is described below! ).
• the overlapping width is 0.4 rinsing, the seam welded portion will overlap the material thickness. It's too small to fit together j? However, the effect of suppressing the scattering of the molten metal is weak, and the weldability is reduced.
• the overlapping width is 0.0 baskets
• the overlapping margin is large and the force per unit area decreases, so that the generation of molten metal due to local heat generation is promoted, and Good joints can be obtained because the ability to suppress the scattering of molten metal is weak.
• the overlap width tends to be smaller than the conventional 0.4 haze. As a result, reducing the overlapping width is not an effective measure to reduce the force for suppressing the scattering of the molten metal. In the present invention, it was found that the weldability was significantly improved by setting the ratio of the overlap width to the material thickness to be more than 2.0 times and less than 2.4 times.
• the thickness of the material is 0.22
• the tin free steel metal chrome amount: 150 / r hydrated oxidation
• temper T — 4 temper T — 4 as the original plate
• the material TFS is tin-free steel of the chromium type, and the material LTS has a tin adhesion of 0.55 f / rri.
• the numbers in the table are the ratios of the overlap width to the material thickness, and the weldability evaluation results are indicated by ⁇ and X.
• ⁇ indicates that the appropriate current range is 300 A or more and the weldability is good, ⁇ indicates that the appropriate current range is more than 0 A and less than 500 A, and X indicates the appropriate current range if the weldability is slightly better. Is negative
• GMFI GMFI
• the appropriate range of the material thickness to which the welding method of the present invention is applied is more than 0.2 mm and less than 0.25 lord.
• Table 2 shows the welding test results when various materials were welded with a copper wire resistance seam welding method when the material thickness was 0.22 leakage and the electrode pressing force was 40 k. .
• Fig. 5 shows the results of welding experiments using a steel stapling with an overlap width of 0.3, 0.55 inversion, 0.40 basket, 0.45 mm, and 0.50 haze. Shown in Fig. 5 shows the relationship between the ratio of the overlap width to the material thickness and the lower limit current a and the upper limit current b of the welding current, as in Fig. 4.
• the region c is the proper current range. In this case as well, if the overlap width exceeds 2.0 times, and if it is less than 2.4 times, a sufficiently wide welding appropriate current range can be obtained.
• the material TFS is a chrome-type tin-free steel.
• the numbers in the table are the ratios of the overlap width to the material plate thickness, and the results of the weldability evaluation are indicated by ⁇ ; X.
• ⁇ indicates that the appropriate current range is 500 mm or more and the weldability is good, indicates that the appropriate current range is more than 0 A and is less than 500 A, and that the weldability is somewhat good. Negative weldability is poor.
• container materials with localized and non-uniform electrical resistance heat generation are considered to have inferior weldability to soldering cans.
• the plating metal is harder than tin or when the chemical conversion coating is thick, the weldability is reduced, but the present invention is effective for all such materials. .
• Table 4 shows the results when the material thickness is so-called, 0.25 leakage, 0.52 basket, and D-welding of various materials using the copper wire resistance seam welding method. The results of the welding test are shown. Table 4
• the materials used for this welding were E 2.8 Z 2.8 for soldering cans with tin adhesion of 2.8 f / rri, and LTS and Ni for ignition with 0.55 f tin adhesion.
• This is a tin-free steel TFS of the same steel and chrome type.
• the ratio of the overlap width to the material thickness exceeds 2.0 times and less than 2.4 times, a sufficiently wide appropriate current range is obtained for all materials regardless of the material thickness. Have.
• the electric resistance seam welding method of the present invention is used. Is useful for extending the proper current range of difficult-to-weld materials! ), It is suitable for manufacturing welding cans using difficult-to-weld materials that have not been conventionally used for canned foods, such as tin-free steel.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Electroplating Methods And Accessories (AREA)
• Coating With Molten Metal (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)
• Arc Welding In General (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=26425084

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Citations (1)

Family Cites Families (3)

• 1983
  • 1983-06-10 JP JP58103886A patent/JPS59229290A/ja active Granted
• 1984
  • 1984-12-10 CH CH3144/86A patent/CH668930A5/fr not_active IP Right Cessation
  • 1984-12-10 WO PCT/JP1984/000583 patent/WO1986003442A1/ja active Application Filing
  • 1984-12-10 DE DE19843490793 patent/DE3490793T1/de not_active Ceased
  • 1984-12-10 GB GB08612297A patent/GB2178682B/en not_active Expired

Patent Citations (1)

Also Published As

Similar Documents

Legal Events