When two metals are joined together by either use of solder (filter metal) or by melting is called soldering. Normally the adjoining metal has a higher melting point than the solder. Almost every filter metal is made of lead but due to health and environmental risks, it is always advisable to use alloys which are lead free for both plumbing and electronic purposes. When carrying out the process of assembly and soldering in Ferrisburg Vermont the following factors must be considered.