Paʻi wiliwili
ʻO ka pinepine welded paipu wili puʻupuʻu ʻo ia kekahi o nā ʻāpana nui o ke kaʻina hana kuʻi, ma hope o ka wela ʻana o nā ʻaoʻao ʻelua o ka paipu i ka wela welding a me ke kaomi ʻana i nā huahana i welded ma lalo o ke kaomi e hana i ka palaoa metala maʻamau e like me nā kristal. No ka mea, aia paha ka laula o ka paipu a me ka mānoanoa, a me ka wela o ka nalu a me ka wikiwiki o ka wiliwili, e pili ana paha ia i ka hoʻololi ʻana i ka ikaika kaomi. Kiʻekiʻe-frequency kuʻihao paipu extrusion nui ka maʻamau e hoʻoponopono i ka mamao ma waena o ka wili wili, squeeze rollers hiki no hoi ke hoohana i ka mua a me ka hope okoa e hoomalu i ka paipu circumference.

Ka māmā wiliwili
ʻO ka wikiwiki o ka welding kekahi o nā palena nui o ka ʻenehana welding, ʻōnaehana hoʻomehana a hoʻopaʻa ʻia i ka wikiwiki o ka strain a me ka wikiwiki crystallization. I ka wā kiʻekiʻe-frequency welded paipu, kuʻihao maikaʻi me ka hoʻokēʻai hoʻokēʻai wikiwiki piʻi. No laila, i ka wā kiʻekiʻe-frequency welded paipu, mechanical lako a pono i loko o ka welding apparatus wae.