one table is input into another

I have 2 tables .. one will act as the input for another ...

I have a routine that produces table1 records.  These are records I want to status.

Table 2 is the status for the records.   What I want to do is take the records that are

in Table 1 and add them to Table 2.  The ids, serial are the keys.  What is in table 1 isn't

in table 2.   so I want to add the id, serial from table 1 to table 2 and hard code the status field and key_ed columns. 

Table 1     id,  serial
Table 2     id, serial, status, key_ed

I've been trying things like