The type of joint made by a soldering iron will depend on the type of solder alloy used to bond the two materials together. There are many different types of solder alloys, and they are suited for different applications. Soldering is suitable for bonding most types of metals, but can be difficult to use when joining aluminium. If you are soldering zinc or galvanized iron, you must not use a solder that contains antimony, or the joint will be brittle.
Generally speaking, the resistance of soldered joints to shear force at room temperature depends the following:
The distance between the materials joined together.
The temperature at which the soldering was performed.
The amount of time the solder was heated.
The composition of the materials joined together.