Historically, threaded steel fasteners driven into tapped holes have been a common joining method for magnesium. Not only does this involve costly drilling and tapping operations, but it can also lead to long-term joint instability. Several fastener designs currently exist addressing these issues in different ways. Various thread-forming fasteners made of steel have been designed which reduce in-place costs by up to 40%. However, the load retention for steel in magnesium remains a concern. Aluminum machine screws have been developed which improve load retention but have limited load-carrying ability and increase joint costs significantly. ATF and EJOT will present comparison testing including torque analysis, clamp load at raised temperature, and uniaxial pull-out force. As a conclusion, ATF and EJOT will provide recommendations to design a robust screw joint in magnesium.
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