Stainless Steel Electrodes: "H" Versus "L" and Coating Types
You do need to use an E308H electrode. The reason why will be explained shortly. Regarding your second question, "308" is a particular type of stainless steel. It is typically used to make welding electrodes and used to join common types of austenitic stainless steels, such as 301, 302, 304 and 305.