Exercise A$\mathrm{.}4$

Revise these sentences, breaking them down into shorter ones.$$

$1.$ Lack of fusion in welding may be caused by an incorrect current adjustment, an improper electrode size or type, dirty plate surfaces, failure to raise to the melting point the temperature of the base metal or the previously deposited weld metal, or improper fluxing, which fails to dissolve the oxide and other foreign material from surfaces to which the deposited metal is intended to fuse.

Example :

ORIGINAL

Welding is a method of permanently joining two pieces of metal, usually by means of heat, which partially melts the surface and combines the two pieces into a single piece, and after the metal cools and hardens, the welded joint is as strong as any other part of the metal. $($fifty words$)$

REVISION

Welding is a method of permanently joining two pieces of metal, usually by means of heat. The partially melted surfaces are combined into a single piece. After the metal cools and hardens, the welded joint is as strong as any other part of the metal. $($sixteen words; ten words; nineteen words$)$