SERVICE Businesses FSW (Friction Stir Welding) Division

Project overview

Here at KEIHIN RAMTECH, we introduced the FSW (friction stir welding) system earlier than most companies in Japan, and have accumulated a wealth of expertise in welding technology. We entered a licensing agreement with TWI in 2007 and have continued to achieve further technical developments. From pilot production by FSW to large-scale mass production, we can offer welding services in various materials such as copper, aluminum, magnesium, and iron. Offering a variety of technological solutions and support, we can be the perfect business partner for our customers.

We will solve the problems
you are facing!

  • Overwhelmingly better welding strength than fusion welding or other welding methods

  • Test welding and verification with sample material is possible

  • It is possible to join dissimilar materials

  • Low heat input enables welding with reduced distortion

  • We can propose existing product designs customized to FSW

Features

Welding with less strain and fewer defects than fusion welding

Welding with less strain and fewer defects than fusion welding

Good shape stability and reproducibility (no skilled worker required)

Excellent weldability by a mechanical process

Excellent weldability by a mechanical process

Weld strength close to that of the base material

Welding of difficult-to-weld materials

Welding of difficult-to-weld materials

Al, Mg, Cu alloys, Fe alloys (SUS), welding between different materials

Improved environmental resistance

Improved environmental resistance

Unlike fusion welding, FSW is a solid phase welding process. Tig and Mig do not produce fumes or sputter. Also, power is saved because the welding is done in the atmosphere.

Features of the welded parts

Material strength increases when the grain size is smaller, according to the Hall-Petch relationship.

For FSW

For FSW

For MIG

For MIG
Features of the welded parts

Comparison of FSW and fusion welds

Characteristics FSW Dissolution welding
Welding
temperature
(℃)
2/3Tm Tm or more
Organization Microcrystalline tissue
(without segregation)
Molten coagulated tissue
Deformation Little deformation Large thermal deformation
Mechanical properties Good Decreased elongation
Energy consumed 2/3 of fusion welding Large

Welding principle

A rotating special tool called a probe is pressed against the material surface on the joining line. This creates a heat of friction between the probe and the material, which in turn softens the material.
Welding is performed by scanning the probe while stirring (mixing) the abutments which are in a plastic (solid) phase.
This is a [solid phase] method different from fusion welding.

Welding principle
Welding principle

Achievements and practical examples

Spot welding

Spot welding

Curved butt joint

Curved butt joint

Thin-plate butt joint

Thin-plate butt joint

Thick-plate butt joint (Cu : 10t-40t)

Thick-plate butt joint (Cu : 10t-40t)

Circumference butt joint

Circumference butt joint

Curved butt joint

Curved butt joint

Straight lap joint

Straight lap joint

Aluminum heater joints

Aluminum heater joints

SUS304 butt joints

SUS304 butt joints

Aluminum heater joints

Aluminum heater joints

Friction welding with pressure(Cu-sus)

Friction welding with pressure(Cu-sus)

Heat sink joints

Heat sink joints

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