Which joining method allows for the assembly of materials accessible from only one side?

The joining method that allows for the assembly of materials accessible from only one side is pop rivets. Pop rivets are particularly advantageous in situations where access to both sides of the materials being joined is limited or impossible. When using pop rivets, a single tool can be applied to set the rivet from one side, effectively pulling the rivet body through the materials and creating a strong, permanent bond. This makes pop rivets a popular choice in various applications, especially in construction, automotive manufacturing, and lightweight structures where easy access for fastening is restricted.

Other methods like electric arc welding, soldering, and bolts and nuts typically require access to both sides of the joint. For instance, welding necessitates the welder’s access to both surfaces to create the heat and fusion needed for a strong bond. Similarly, while bolts and nuts can be used from one side in some situations, they generally require access to affix the nut on the opposite side, making them less suited for one-sided assembly compared to pop rivets.