1. Nā ʻōhū
ʻO ka hapa nui o nā ʻōhū ma ke kikowaena o ka weld bead, a hūnā ʻia ka hydrogen i loko o ka metala weld ma ke ʻano o nā ʻōhū. ʻO ke kumu nui, ʻo ka wili welding a me ka flux ka makū ma ka ʻili a hoʻohana pololei ʻia me ka maloʻo ʻole. Eia kekahi, ʻoi aku ka kiʻekiʻe o kēia manawa i ke kaʻina hana kuʻi. ʻO ka liʻiliʻi, ʻoi aku ka wikiwiki o ka hoʻoheheʻe ʻana, a e hana pū ʻia kēia inā e wikiwiki ka paʻa ʻana o ka metala.

2. Oki lalo
ʻO ka undercut he ʻano V-like groove e ʻike ʻia ana ma ka lihi o ka weld ma ka laina waena o ka weld. ʻO ke kumu nui ʻo ka wikiwiki o ka welding, ka manawa, ka volta, a me nā kūlana ʻē aʻe ʻaʻole kūpono. I waena o lākou, ua kiʻekiʻe ka wikiwiki o ka welding a ʻaʻole kūpono ke ʻano o kēia manawa. He mea maʻalahi ke hana i nā hemahema undercut.

3. Nā māwae wela
ʻO ke kumu o nā māwae wela ke kiʻekiʻe loa ke koʻikoʻi weld, a i ʻole ke kiʻekiʻe loa o ka SI silicon element i ka weld metala, aia kekahi ʻano o ka sulfur māhā, ʻo ka blank he pā me kahi wahi hoʻokaʻawale sulfur ikaika (no ka Steel boiling), nā māwae i hana ʻia e nā sulfides e komo ana i ka metala weld i ka wā o ke kaʻina hana wili.

4. ʻAʻole lawa ke komo ʻana o ka welding
ʻAʻole lawa ka metala o nā welds o loko a me waho, a i kekahi manawa ʻaʻole i komo ka welding.
Ke kaʻina helu no ka paipu kila welded: (ka anawaena o waho – ka mānoanoa o ka paia) * ka mānoanoa o ka paia * 0.02466 = ke kaumaha o ka mika o ka paipu kila welded {kg
Ka helu ʻana o ka paipu kila Galvanized: (ka anawaena o waho – ka mānoanoa o ka paia) * ka mānoanoa o ka paia * 0.02466 * 1.06 = ke kaumaha o ka paipu kila welded no ka mika {kg