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?
flux is used to clean surfaces before soldering |
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solder has a comparatively low melting point |
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solder is an alloy of lead and tin |
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soldering can only join metals |