Dual Phase (DP) steel. a type of Advanced High Strength Steel (AHSS) with a thickness of 1. 7 mm. is used to fabricate single-hat components that are then joined to the base plate using two friction stir welding processes: friction stir lap welding (FSLW) and friction stir spot lap welding (FSSLW). https://www.marketingjeunesse.com/product-category/straightner/