In GMAW, what joint configuration is used for joining two parallel plates with minimal edge preparation?

In Gas Metal Arc Welding (GMAW), a lap joint is commonly used for joining two parallel plates with minimal edge preparation. This configuration involves overlapping one plate on top of another, which allows for significant surface area contact without the need for extensive preparation of the edges. The nature of lap joints makes them suitable for situations where strength is needed but where preparing the edges for a seamless fit wouldn't be practical or necessary.

Lap joints, by their design, can also accommodate variations in the thickness of the materials being joined and still maintain structural integrity. They are particularly advantageous in applications where the alignment of two parallel plates may not be perfect since the overlapping nature allows for compensation.

In contrast, butt joints require the edges of the plates to be aligned and may necessitate beveling for optimal fusion, making them less ideal for quick or less precise applications. T-joints and corner joints serve different geometrical configurations and are typically utilized when joining plates at right angles, which would not be applicable in the scenario involving two parallel plates. Thus, the lap joint's characteristics make it the best choice when minimal preparation is desired.