Data Type Convertion in ABAP

Hi,

i want to convert a numeric type field to character type field in ABAP,

and also i want to concatenate some set of different types of field to a character type field at last

if i give just like this

<b>CONCATENATE ' ' it_pa0000-pernr it_pa0105-usrid ' ' it_pa0105-begda into record_tab-string.</b>

it remove space out from the string i need space also in the <b>record_tab-string</b>,

Reg,

Hariharan