Ka hana wiliwilihe hana metala maʻamau i hiki ke hoʻohana ʻia e hui pū i nā ʻano mea metala. I ke koho ʻana i nā mea hiki ke welded, pono e noʻonoʻo ʻia nā mea e like me ke ʻano kemika o ka mea, ka helu heheʻe, a me ka conductivity thermal. ʻO nā mea maʻamau i hiki ke welded e like me ke kila kalapona, ke kila galvanized, ke kila kila, ka alumini a me ke keleawe.

ʻO ke kila kalapona kahi mea hoʻoheheʻe maʻamau me ka weldability maikaʻi a me ka ikaika, kūpono ia no nā noi ʻoihana he nui. Hoʻohana pinepine ʻia ke kila galvanized no ka pale ʻana i ka corrosion a hilinaʻi kona weldability i ka mānoanoa a me ka maikaʻi o ka papa galvanized. ʻO ke kila kila ke kūpaʻa ʻino a kūpono i nā kaiapuni e koi ana i ke kūpaʻa ʻana, akā ʻo ka wili ʻana i ke kila kila kila kūikawākaʻina hana wilia me nā mea waiwai. ʻO ka alumini he metala māmā me ka maikaʻi o ka wela a me ka uila, akā pono ka alumini i nā ʻano hana kuʻi ʻana a me nā mea hao. He maikaʻi ka uila a me ka thermal conductivity o Copper a kūpono i nā māla uila a me ka wela, akā pono ka noʻonoʻo ʻana i nā pilikia oxidation.

Ke koho ʻana i nā mea welding, pono e noʻonoʻo ʻia nā hiʻohiʻona o ka mea, ka noi a me ke kaʻina hana welding e hōʻoia i ka maikaʻi a me ka hana o ka pilina welded. ʻO ka welding kahi kaʻina hana paʻakikī e pono ai ka noʻonoʻo piha ʻana i ke koho ʻana i nā mea waiwai, nā ʻano hana wili a me nā ʻenehana hana e hōʻoia i ka maikaʻi a me ka hilinaʻi o ka hui welded hope.