DSAW(apa meji ajija submerged aaki welded paipu)awọn abuda: ilana iṣelọpọ ti paipu welded jẹ rọrun, ṣiṣe giga, idiyele kekere, idagbasoke iyara.Agbara ti paipu welded ajija ni gbogbogbo ga ju paipu dsaw ati pe o le dín iṣelọpọ billet ti paipu iwọn ila opin nla, o tun le lo iwọn kanna ti iṣelọpọ billet ti awọn iwọn ila opin oriṣiriṣi ti paipu.Bibẹẹkọ, ni akawe pẹlu gigun kanna ti paipu okun taara, gigun Weld pọ si nipasẹ 30 si 100%, ati oṣuwọn iṣelọpọ kekere.

DSAW (apa ilọpo meji ti o wa ni inu aaki welded paipu) ni lilo pupọ ni gaasi adayeba, epo epo, awọn kemikali, ina, alapapo, idominugere, alapapo nya si, penstock hydropower, agbara gbona, omi ati awọn opo gigun ti o jinna miiran, piling, dredging, awọn afara , irin ati awọn aaye imọ-ẹrọ miiran.