Welding: ʻIke ʻia hoʻi ʻo ka hui ʻana a i ʻole ka welding, he hana hana a me ka ʻenehana no ka hoʻohui ʻana i nā metala a i ʻole nā mea thermoplastic ʻē aʻe e like me ka plastics ma o ka hoʻomehana ʻana, ka wela kiʻekiʻe a i ʻole ke kaomi kiʻekiʻe.