(LSAW - Dogon Ruwan Arc Welding), iri ɗaya ne da waldawar hannu (LSAW - Welding Submerged Arc) wanda yayi daidai da waldawar hannu ta LSAW-Longitudinal Submerged Arc waldi.Wurin shine yana tare da ragowar mold, amma slag ba shine mai rufin lantarki ba.Ya ƙware wajen narkewar ruwa.Wannan tsarin rufewa ya ƙunshi mazurari wanda aka yi masa walda ta bututu zuwa gaban magudanar ruwa.

Ya kamata a zaɓi diamita na walda mai igiya biyar bisa ga yanayin walda, lokacin da wayoyi 5 na yanzu a cikin diamita iri ɗaya don dacewa da kewayon yanzu, zaku iya amfani da haɗin diamita na waya iri ɗaya.Five waya submerged baka waldi halin yanzu da baka ƙarfin lantarki saituna, za ka iya danna 1 siliki high halin yanzu, da ƙarfin lantarki a hankali canzawa zuwa biyar waya kananan halin yanzu da ƙarfin lantarki.A cikin raguwar gabaɗaya na yanzu na 10% zuwa 30% na layin sannu a hankali an rage, baka a cikin ƙarfin ƙarfin lantarki na 1 ~ 3V ya karu a hankali.