This online course is segmented into three parts: 1) Overview of Physical Metallurgy, 2) Introduction to Welding Metallurgy of Steel, and 3) Welding Metallurgy of Stainless Steels. Each of these instructional units can be completed by a student as a micro-credential course itself (7.5 PDH credits each), or all three can be taken together as the complete Welding Metallurgy credentialing course to earn 22.5 PDH credits. Click here for a detailed course description. To see an online course preview on, click here.