If, having joined the tables, you align their left & right borders, you could use the column width dialogue in the table Tools context menu to manually set the widths.

Alternatively, having aligned the left & right borders, you could use the 'distribute columns' tool in the table Tools context menu to make all the columns an even width. If the results widths aren't what you want, you can then click on any of the column borders to drag the columns borders left/right - or you can use the column width dialogue in the table Tools context menu to manually set the widths.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]