Na-ehicha
Mmepụta ziri ezi na nkenke dị elu, ihe na njikọ welding nwere ike mechie kpamkpam, na ọdịdị mara mma; o nwere njirimara nke ike dị elu na nchekwa; ọ nwere ezigbo plasticity na ike siri ike, ọ pụkwara iguzogide nnukwu ike mgbe a na-etinye ya n'ime ike mpụga.