Previous
Next

Basic joint designs for FSW

Basic joint designs for Friction Stir Welding - FSW

FSW welding needs a proper joint design, backing/anvil, support underneath - design for hollow profiles, enough material around FSW joint due to collapse and/or overheat material and good clamping.

Some of the basic joints are presented below for conventional FSW and Stationary shoulder - SSFSW welding.

*All joints need a good clamping force to hold and positioning material for FSW.

Butt joint

Butt joint

Material

Backing/Anvil

Due to large down force in FSW a support is required.

Butt joint

Butt joint

Material

No backing/anvil underneath FSW joint.
Lack of support will lead to collapse of material.

Overlap joint

Overlap joint

Material

Backing/Anvil

Sufficient support.

Butt joint

Butt joint

Hollow profile

For hollow profiles, enough material below the force is required.

Butt joint

Butt joint

Hollow profile

No backing/anvil underneath FSW joint.
Lack of support will lead to collapse of material.

Overleap-butt joint combination

Overleap-butt joint combination

Hollow profile

Enough material to prevent collapse of material on side.

Overlap joint

Overlap joint

Hollow profile

Good support to manage the down force.

Overlap joint

Overlap joint

Hollow profile

No backing/anvil underneath FSW joint.
Lack of support will lead to collapse of material.

Overlap joint

Backing/Anvil

"Obstacle" - depending on tool dimension this can prevent access to ideal position. It can be solved with tool that has longer neck but that means welding speed will be slower and neck will not be stiff as standard tool.

Butt joint

Backing/Anvil

Good support below and from side required to prevent collapse of material on side.

Butt joint

Backing/Anvil

Not enough backing/anvil below and from the side.
Lack of support will lead to collapse of material on sides and below.

Butt joint

Backing/Anvil

Good design to have enough space around tool and enough material on side due to shoulder diameter.

Overlap joint

Backing/Anvil

Overlap joint with backing and enough material around joint. No collapse of material.

Overlap joint

Backing/Anvil

Not enough backing and joint is too close to the edge on plate under and no side support. Large risk of collapse of material.

Overlap joint

Backing/Anvil

Good backing and side support for plate.

x

x

Loading..