Joint structure

Patent metadata

Field	Value
Publication number	US-12454970-B2
Application number	US-201716087145-A
Country	US
Kind code	B2
Filing date	Mar 24, 2017
Priority date	Mar 30, 2016
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A joint structure includes a first metallic material having a first projection, a second metallic material similar to and weldable to the first metallic material, and a different material having a first penetrating part and sandwiched between the first and second metallic materials, the different material being difficult to weld to the first and second metallic materials. The first projection is smaller than the first penetrating part and is spaced from the rim of the first penetrating part. The first projection is positioned in the first penetrating part and spaced from the second metallic material by a gap. The gap has a size of a predetermined percentage of the thickness of the first projection to which arc welding is applied. The first and second metallic materials are melted and joined together inside the first penetrating part to compress and fix the different material, so all three are fixed together.

First claim

The invention claimed is:

1. An arc welding method comprising:
placing a middle plate in contact with and between an upper plate and a lower plate that are made of metals weldable to each other,
the upper plate has an upper plate projection extending from a lower surface of the upper plate,
the lower plate has a lower plate projection extending from an upper surface of the lower plate,
wherein the middle plate has a penetrating part and the middle plate is difficult to weld to the upper plate and the lower plate, a material of the middle plate being different from the upper plate and the lower plate,
in the placing the middle plate in contact with and between the upper plate and the lower plate, an upper-lower plate gap is formed between a lower surface of the upper plate projection and an upper surface of the lower plate projection, the upper-lower plate gap corresponding to a region in the penetrating part, and
the arc welding method further comprises, after the placing of the middle plate in contact with and between the upper plate and the lower plate, applying an arc on an upper side of the upper plate projection disposed toward the region corresponding to the penetrating part, so that the upper plate projection and the lower plate projection are fused and bonded together via the penetrating part, by which the middle plate is compressed between the upper plate and the lower plate and is fixed to the upper plate and the lower plate by welding the upper-lower plate gap, and
the upper-lower plate gap being configured to prevent a defective weld by having a size that varies within a specific range depending on a thickness of the upper plate on an arc-incident side,
wherein the middle plate includes a resin material,
wherein in the placing the middle plate in contact with and between the upper plate and the lower plate, a middle plate gap is configured between a rim of the penetrating part and an outermost edge of the upper plate projection and between the rim of the penetrating part and an outermost edge of the lower plate projection, the middle plate gap being configured to prevent a defective weld by having a size that varies depending on a thickness and material-type of the middle plate, and
wherein the middle plate gap is configured between an uppermost portion of the rim of the penetrating part and the outermost edge of the upper plate projection and between a lowermost portion of the rim of the penetrating part and the outermost edge of the lower plate projection.

2. The arc welding method according to claim 1 , wherein the upper-lower plate gap is within 4% to 61% of a thickness of the upper plate under the condition that the upper plate projection and the lower plate projection are mild steel.

3. The arc welding method according to claim 1 , wherein
the upper-lower plate gap is within 4% (0.1 mm) to 61% (1.4 mm) of a thickness of the upper plate projection under a condition of,
the thickness of the upper plate projection is 2.3 mm,
the upper plate projection and the lower plate projection are both mild steel,
the middle plate is PET,
metal active gas (MAG) arc welding is applied at an output current of 100 A to 250 A for 0.3 seconds,
an inner edge region of the upper plate projection and the lower plate projection is an area with a diameter of φ 10 mm,
the penetrating part of middle plate has a diameter of φ 12 mm, and
a spot diameter of a region to be irradiated is φ 8 mm.

4. The arc welding method according to claim 1 , wherein
the upper-lower plate gap is within 6% (0.1 mm) to 63% (1.0 mm) of a thickness of the upper plate projection under a condition of,
the thickness of the upper plate projection is 1.6 mm,
the upper plate projection and the lower plate projection are both mild steel,
the middle plate is PET,
metal active gas (MAG) arc welding is applied at an output current of 100 A to 250 A for 0.3 seconds,
an inner edge region of the upper plate projection and the lower plate projection is an area with a diameter of φ 10 mm,
the penetrating part of middle plate has a diameter of φ 12 mm, and
a spot diameter of a region to be irradiated is φ 8 mm.

5. The arc welding method according to claim 1 , wherein
the upper-lower plate gap is within 8% (0.1 mm) to 67% (0.8 mm) of a thickness of the upper plate projection under a condition of,
the thickness of the upper plate projection is 1.2 mm,
the upper plate projection and the lower plate projection are both mild steel,
the middle plate is PET,
metal active gas (MAG) arc welding is applied at an output current of 100 A to 250 A for 0.3 seconds,
an inner edge region of the upper plate projection and the lower plate projection is an area with a diameter of φ 10 mm,
the penetrating part of middle plate has a diameter of φ 12 mm, and
a spot diameter of a region to be irradiated is φ 8 mm.

6. The arc welding method according to claim 1 , wherein
the upper-lower plate gap is within 13% (0.1 mm) to 75% (0.6 mm) of a thickness of the upper plate projection under a condition of,
the thickness of the upper plate projection is 0.8 mm,
the upper plate projection and the lower plate projection are both mild steel,
the middle plate is PET,
metal active gas (MAG) arc welding is applied at an output current of 100 A to 250 A for 0.3 seconds,
an inner edge region of the upper plate projection and the lower plate projection is an area with a diameter of φ 10 mm,
the penetrating part of middle plate has a diameter of φ 12 mm, and
a spot diameter of a region to be irradiated is φ 8 mm.

7. The arc welding method according to claim 1 , wherein in the placing the middle plate in contact with and between the upper plate and the lower plate, the middle plate is in contact with the lower surface of the upper plate and the upper surface of the lower plate.

8. The arc welding method according to claim 1 , wherein the resin material is PET and the middle plate gap is at least 40% or more of the thickness of the middle plate.

9. The arc welding method according to claim 1 , wherein the resin material is a carbon fiber reinforced plastic (CFRP) and the middle plate gap is at least 30% or more of the thickness of the middle plate.

10. An arc welding method comprising:
placing a middle plate in contact with and between an upper plate and a lower plate that are made of metals weldable to each other,
the upper plate has an upper plate projection extending from a lower surface of the upper plate,
the lower plate has a lower plate projection extending from an upper surface of the lower plate,
wherein the middle plate has a penetrating part and the middle plate is difficult to weld to the upper plate and the lower plate, a material of the middle plate being different from the upper plate and the lower plate,
in the placing the middle plate in contact with and between the upper plate and the lower plate, an upper-lower plate gap is formed between a lower surface of the upper plate projection and an upper surface of the lower plate projection, the upper-lower plate gap corresponding to a region in the penetrating part, and
the arc welding method further comprises, after the placing of the middle plate in contact with and between the upper plate and the lower plate, applying an arc on an upper side of the upper plate projection disposed toward the region corresponding to the penetrating part, so that the upper plate projection and the lower plate projection are fused and bonded together via the penetrating part, by which the middle plate is compressed between the upper plate and the lower plate and is fixed to the upper plate and the lower plate by welding the upper-lower plate gap,
the upper-lower plate gap being configured to prev

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Fujiwara Junji
• Kawamoto Atsuhiro
• Nishimura Hitoshi
• Mukai Yasushi
• Yonemori Shigeki

Classifications

• B23K9/232 Primary

  of different metals · CPC title

• B23K2103/18

  Dissimilar materials · CPC title

• B23K9/173

  and of a consumable electrode · CPC title

• B23K9/167

  and of a non-consumable electrode · CPC title

• B23K9/02 Primary

  Seam welding; Backing means; Inserts · CPC title