3 . ▁Con sequently , ▁the ▁temperature ▁in ▁this ▁volume ▁increases ▁extremely ▁rapidly , ▁by ▁ 1 0 8 ▁– ▁ 1 0 9   K / s . ▁ ▁The ▁effect ▁of ▁the ▁electron ▁be ams ▁under ▁such ▁circumstances ▁depends ▁on ▁several ▁conditions , ▁first ▁of ▁all ▁on ▁the ▁physical ▁properties ▁of ▁the ▁material . ▁Any ▁material ▁can ▁be ▁m elt ed , ▁or ▁even ▁ev apor ated , ▁in ▁a ▁very ▁short ▁time . ▁Depending ▁on ▁conditions , ▁the ▁intensity ▁of ▁ev ap oration ▁may ▁vary , ▁from ▁neg lig ible ▁to ▁essential . ▁At ▁lower ▁values ▁of ▁surface ▁power ▁density ▁( in ▁the ▁range ▁of ▁about ▁ 1 0 3   W / mm 2 ) ▁the ▁loss ▁of ▁material ▁by ▁ev ap oration ▁is ▁neg lig ible ▁for ▁most ▁met als , ▁which ▁is ▁favor able ▁for ▁w eld ing . ▁At ▁higher ▁power ▁density , ▁the ▁material ▁affected ▁by ▁the ▁beam ▁can ▁totally ▁ev apor ate ▁in ▁a ▁very ▁short ▁time ; ▁this ▁is ▁no ▁longer ▁electron - be am ▁w eld ing ; ▁it ▁is ▁electron - be am ▁mach ining . ▁ ▁Results ▁of ▁the ▁electron - be am ▁application ▁ ▁The ▁results ▁of ▁the ▁beam ▁application ▁depend ▁on ▁several ▁factors : ▁Many ▁experiments ▁and ▁in numerable ▁practical ▁applications ▁of ▁electron ▁beam ▁in ▁w eld ing ▁technology ▁prove ▁that ▁the ▁effect ▁of ▁the ▁beam , ▁i . e . ▁the ▁size ▁and ▁shape ▁of ▁the ▁zone ▁influenced ▁by ▁the ▁beam ▁depends ▁on : ▁ ▁( 1