Visual inspection
Every welded welding element must be checked visually. Besides assessing the weld bead for form, size and appearance, you should also check the nominal length of the welded stud.
	1. Good welding: The bead is closed and has a shiny surface. There is no visible undercutting at the bottom of the welding element. Small notches between weld bead and stud shaft are unavoidable and can be ignored.
	2. Welding too hot: Deep notches can be seen between weld bead and stud shaft. Due to the strong melting, the melt zone at the stud middle is recessed. The excess weld metal was flung out of the welding zone. (Spring force or lift too low.)
	3. Welding too cold: The form and height of the weld bead are irregular. Distinct undercutting can be seen at the stud edge. Due to the low energy, the melt zone under the complete stud cross-section is very flat. (Spring force or lift too high.)