US 2026/0200007 A1Published application

Friction element welding method

AssigneeJfe Steel Corporation

InventorsKoichi TANIGUCHI, Naoaki MUNEMURA

Life of this patent

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Abstract

A friction element welding method for welding a sheet set including two or more overlapping metal sheets by pressing a rotating element having a tapered portion at a tip into the sheet set. The method includes a first step of removing oxide film on an upper surface of a lower sheet and a second step of pressing the element into the lower sheet to form a welded portion. In the first step, oxide is removed while controlling the penetration ratio in the range of 0.5 to less than 1.3, rotation speed between 4000-8000 rpm, and pressurizing force between 4000-8000 N. In the second step, rotation speed is increased according to a prescribed formula based on the penetration ratio.

Claims4

Dependent claims

A friction element welding method for welding a sheet set including two or more overlapping metal sheets by pressing a rotating element having a tapered portion at a tip into the sheet set,

the method comprising a first step of removing a film of oxide on an upper surface of a lower sheet disposed as a lowermost layer of the sheet set and a second step of pressing the element into the lower sheet to form a welded portion,
wherein, in the first step,
the oxide on the upper surface of the lower sheet is removed while L/t, R1, and P1 are controlled such that 0.5≤L/t<1.3, 4000≤R1≤8000, and 4000≤P1≤8000,
where P1 (N) is a pressurizing force in the first step, R1 (rpm) is a rotation speed in the first step, t (mm) is a height of the tapered portion, L (mm) is a cylinder displacement at the end of the first step, with a cylinder position when the tip of the element comes into contact with the upper surface of the lower sheet set to 0, and L/t is a penetration ratio obtained by dividing the cylinder displacement by the height of the tapered portion,
wherein, in the second step,
a rotation speed in the second step is denoted as R2 (rpm), and an increase in the rotation speed in the second step with respect to the rotation speed in the first step is denoted as ΔR, and
wherein the rotation speed in the second step is increased such that the increase satisfies formula (1) when the penetration ratio L/t at the end of the first step is 0.5 or more and less than 0.8,
that the increase satisfies formula (2) when the penetration ratio L/t at the end of the first step is 0.8 or more and less than 1.0, and
that the increase satisfies formula (3) when the penetration ratio L/t at the end of the first step is 1.0 or more and less than 1.3:
Δ
⁢
R
≥
4
×
(
2
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
,
(
1
)
Δ
⁢
R
≥
2
×
(
3.2
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
,
(
2
)
Δ
⁢
R
≥
0.4
×
(
12
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
.
(
3
)

87 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/134,792Filed 12 Dec 2023
Priority: JP 2022-19847013 Dec 2022
Published: 16 Jul 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B23K 20/12
Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating: the heat being…
B23K 20/124
Controlling or monitoring the welding process: at the beginning or at the end of a weld
B23K 20/1295
Specially adapted for particular articles or work: welding studs
B23K 20/227
Taking account of the properties of the materials to be welded: with ferrous layer

Family

No related US applications are recorded in the indexed filing history.

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Abstract

A friction element welding method for welding a sheet set including two or more overlapping metal sheets by pressing a rotating element having a tapered portion at a tip into the sheet set,

the method comprising a first step of removing a film of oxide on an upper surface of a lower sheet disposed as a lowermost layer of the sheet set and a second step of pressing the element into the lower sheet to form a welded portion,
wherein, in the first step,
the oxide on the upper surface of the lower sheet is removed while L/t, R1, and P1 are controlled such that 0.5≤L/t<1.3, 4000≤R1≤8000, and 4000≤P1≤8000,
where P1 (N) is a pressurizing force in the first step, R1 (rpm) is a rotation speed in the first step, t (mm) is a height of the tapered portion, L (mm) is a cylinder displacement at the end of the first step, with a cylinder position when the tip of the element comes into contact with the upper surface of the lower sheet set to 0, and L/t is a penetration ratio obtained by dividing the cylinder displacement by the height of the tapered portion,
wherein, in the second step,
a rotation speed in the second step is denoted as R2 (rpm), and an increase in the rotation speed in the second step with respect to the rotation speed in the first step is denoted as ΔR, and
wherein the rotation speed in the second step is increased such that the increase satisfies formula (1) when the penetration ratio L/t at the end of the first step is 0.5 or more and less than 0.8,
that the increase satisfies formula (2) when the penetration ratio L/t at the end of the first step is 0.8 or more and less than 1.0, and
that the increase satisfies formula (3) when the penetration ratio L/t at the end of the first step is 1.0 or more and less than 1.3:
Δ
⁢
R
≥
4
×
(
2
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
,
(
1
)
Δ
⁢
R
≥
2
×
(
3.2
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
,
(
2
)
Δ
⁢
R
≥
0.4
×
(
12
-
L
)
×
(
(
12000
-
R
⁢
1
)
/
100
)
.
(
3
)

87 more elements

Facts

Application

19/134,792Filed 12 Dec 2023

Priority

JP 2022-19847013 Dec 2022

Published

16 Jul 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

B23K 20/12
Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating: the heat being…
B23K 20/124
Controlling or monitoring the welding process: at the beginning or at the end of a weld
B23K 20/1295
Specially adapted for particular articles or work: welding studs
B23K 20/227
Taking account of the properties of the materials to be welded: with ferrous layer