ʻO ka paipu welded he paipu kila i hana ʻia e ke kuʻi ʻana i ka ʻili kila i loko o ke ʻano paipu. Hoʻohālikelike ʻia ia e ke kumu kūʻai haʻahaʻa haʻahaʻa, ʻoi aku ka maikaʻi o ka hana kiʻekiʻe a me ka maʻalahi o ka hana ʻana, a hoʻohana nui ʻia i ke kūkulu ʻana, ka ʻaila, ka ʻoihana kemika, nā mīkini hana a me nā māla ʻē aʻe. He maikaʻi ka ikaika a me ka lōʻihi o ka paipu welded. Me ka holomua o ka ʻenehana, e hoʻonui mau ana ka hana a me ka hoʻohana ʻana o nā paipu welded, a hoʻololi mālie i nā pono noi nui aʻe.