Sentence:  Subsequently E. H. Dix, Jr., at Alcoa Research Laboratories established methods to metallurgically <WSD>clad</WSD> commercial aluminum to both sides of a 2017-T4 (then known as 17S-T) sheet to obtain outstanding corrosion protection. 
Meaning of the word marked with <WSD> tags:  To cover (with insulation or another material); to surround, envelop.