Using a variable in a path

First post, thanks for helping. This code does not work...

$WRK_DIR="D:\Tmp\Test1"
$WRK_DIR2 = '$WRK_DIR\Test2'

Writing to the console gives me...

$WRK_DIR = D:\Tmp\Test1
$WRK_DIR2 = $WRK_DIR\Test2

$WRK_DIR is not resolved.

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