Soldering is a low-temperature process by which two or more items (typically metal) are joined together by melting a filler metal (solder) into the joint. An electrically powered soldering iron or soldering gun is used to melt the solder which is an alloy of lead and tin that has a melting point below the melting point of the items being joined. A chemical cleaning agent called flux is also used to clean the surfaces before soldering.
Which of the following statements about solding is not true?
solder has a comparatively low melting point |
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flux is used to clean surfaces before soldering |
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solder is an alloy of lead and tin |
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soldering can only join metals |