joint 2 datatable with column type double with a seperater

Can anyone please tell me how to merge 2 datatable of column type double with a seperator (|). one with datetime header and 2nd table with integer headers, like this
 
table 1
01/02/2015   01/03/2015
  12346          47894
 
table 2
1               2
7899       45678
 
to become
 
01/02/2015        01/03/2015
 
12346 | 7899    47894 | 45678
 
thanks