The purpose of the spring in a spring energized seal is to create a positive seal in the absence of system pressure. Unlike garter springs that pull in one direction, Cantilever, Slant Coil and Helical springs are designed to apply force in two directions. This is why the correct spring centerline and a strong weld are critical. To the seal, the spring should look continuous without any breaks or voids along either contact surface. When there is a gap in the spring, a leak path is created and the seal will perform inconsistently if not fail altogether. The illustrations below show the difference between a good, continuous spring versus a non-welded spring with gaps.
Although a spring energized seal can be assembled without welding the spring, the best practice for a consistent product is to always do so. Let Maudlin help with this practice by providing pre-cut and welded spring for your application.