ʻO ka paipu wili liʻiliʻi liʻiliʻi i kapa ʻia ka paipu kila liʻiliʻi liʻiliʻi, ʻo ia ka paipu kila i hana ʻia ma ke kuʻi ʻana i kahi pā kila a i ʻole ke kaula hao ma hope o ka crimped. ʻO ke kaʻina hana o ka paipu welded liʻiliʻi liʻiliʻi he maʻalahi, kiʻekiʻe ka maikaʻi o ka hana, nui nā ʻano a me nā kikoʻī, a liʻiliʻi ke kumukūʻai o nā mea hana, akā ʻoi aku ka haʻahaʻa o ka ikaika ma mua o ka paipu kila seamless. Mai ka 1930s, me ka hoʻomohala wikiwiki ʻana o ka hana mau ʻana o ke kila kila kiʻekiʻe a me ka hoʻomaikaʻi ʻana i ka ʻenehana wili a me ka nānā ʻana, ua hoʻomaikaʻi mau ʻia ka maikaʻi o nā welds, a ke hoʻonui nei nā ʻano a me nā kikoʻī o nā paipu wili liʻiliʻi. pani ʻia i loko o nā māla ʻoi aku ka maikaʻi o ka paipu kila ʻole. Wehewehe ʻia ka paipu kila welded i ka paipu wili wili pololei a me ka paipu wiliwili ʻia e like me ke ʻano o ka weld.

ʻO nā blanks i hoʻohana ʻia no nā paipu wili liʻiliʻi liʻiliʻi he mau papa kila a i ʻole nā ​​ʻāpana, i hoʻokaʻawale ʻia i nā paipu i hoʻopaʻa ʻia i ka umu ahi, nā paipu uila-welded (resistance-welded), a me nā paipu arc-welded ma muli o kā lākou mau kaʻina hana wili. ʻElua ʻano paipu welded: paipu wili wili pololei a me ka paipu wiliwili spiral. Ma muli o kona ʻano hopena, ua hoʻokaʻawale ʻia i nā paipu wili a puni a me nā paipu welded kūikawā (square, flat, etc.).

ʻO ke kaʻina hana o ka paipu welded liʻiliʻi liʻiliʻi he maʻalahi, kiʻekiʻe ka hana pono, haʻahaʻa haʻahaʻa a me ka hoʻomohala wikiwiki. ʻOi aku ka ʻoi aku o ka ikaika o nā paipu wiliwili spiral ma mua o nā paipu wili wili pololei. Hiki ke hana ʻia nā paipu welded me nā anawaena nui aʻe mai nā billet ʻoi aku ka liʻiliʻi. Hiki ke hana ʻia nā paipu welded me nā anawaena like ʻole me nā bilets o ka laulā like. Eia nō naʻe, ke hoʻohālikelike ʻia me ka paipu seam pololei o ka lōʻihi like, hoʻonui ʻia ka lōʻihi weld seam e 30 a 100%, a ʻoi aku ka haʻahaʻa o ka wikiwiki. No laila, ʻo nā paipu wiliwili liʻiliʻi liʻiliʻi, ʻo ka hapa nui o ka hili ʻia ʻana o ka humuhumu pololei, a ʻo nā paipu wiliwili anawaena nui ka nui o ka wili ʻia.