1: Njirimara nke ọkpọkọ nchara kwụ ọtọ nwere usoro mmepụta dị mfe, nrụpụta mmepụta dị elu, ọnụ ala dị ala, mmepe ngwa ngwa, na ịdịte aka dị mma. Àgwà nke ngwaahịa ọkpọkọ welded nwere ike iji tụnyere ọkpọkọ nchara, usoro mmepụta dị mfe, ọ dịkwa mfe ịgbanwe nkọwa ngwaahịa na mmepụta. Ọnụ ego a na-eri dị ala karịa nke ọkpọkọ nchara na-enweghị nkebi, ya mere ojiji ya na-abawanye kwa afọ na ngwa ngwa ya na-abawanye ụba.

2: Njirimara nke epoxy resin: Ihe nkiri agba mgbe a gwọchara ya site na resin epoxy siri ike na mmiri anaghị egbochi mmiri, anaghị egbu egbu, ọ dịghịkwa emetọ mmiri. Mgbachi siri ike, ezigbo mmachi n'etiti ihe nkiri agba. Ọ nwere ihe ndị na-egbochi nchara na mmiri na-eguzogide ma na-eji ihe dị mma na-egbochi nchara iji hụ na ọ na-arụ ọrụ mgbochi nchara. Ọ nwere ezigbo ike n'ibu, ihe nkiri agba siri ike, nguzogide eyi, yana nguzogide mmetụta. Ọdịnaya siri ike dị elu na ihe mkpuchi mkpuchi dị oke. Na-agwọ ọrịa na ụlọ okpomọkụ ka ọ bụrụ ihe nkiri. Ọ dịghị mkpa maka nnukwu akụrụngwa ihicha. Ihe mkpuchi epoxy bụkwa ihe na-adịghị egbu egbu, na-ahụ maka nchekwa mmiri.