Welder blowing house fuses, was alright for the past 5 years. welded has had new leads, also electric leads

there is no seal at the feed rollers around the wire as it requires the correct gauge wire and feed hole to slow down the loss of gas at that point ( easier for the gas to escape up the wire housing and out the welding end )
the gas is allowed to flow when the welding trigger is operated as that opens a gas solenoid that allows gas to the welding wire tube to exit past the shroud around the welding point

read you user manual well to be acquainted with the machines operation, and if there is a persisting problem talk with your supplier and consider a warranty service check

You say you lost power to the welder. Did you check the circuit breaker where the power comes from in the breaker panel?
It will be a 2 pole breaker. If you mean the welder quit, then you will have to unplug it from 220 volt and open it up where the wire goes into the welder and see if the fuses are blown, if they are replace with the same type of fuses and try to weld again. If they blow again then you have a bigger problem and you should have a welding person take a look at it.

The Rossi 220bz mig welder comes set up to use gas welding, that is with the Mig electrode connected to the positive terminal, inside the machine.
To use gasless mig wleding, the mig wire must be disconnected from the positive terminal inside the machine and reconnected to the Negative terminal - inside the machine. Open both the side coveres of the welder using a phillips screwdriver. Use a 13mm spanner to undo the hex nut holding the thick copper Mig lead to the terminal named positive, then lead it through the machine to the terminal on the oppisite side of the machine, labelled negative and screw it in place there with a 13mm hex screw. Be carefull not to bump any of the many electric parts inside the machine.
If you run the Mig welder in gasless mode with positive earth and positive elecrode it will blow the household electric fuse.
If you run the Mig welder in gasless mode with negative earth and positive electrode it will work, but the end of the Mig gun tip will get very very hot and start smoking abnormally from excessive heat.
But if you take the side covers off and rewire it (takes about 10 minutes) to negative Mig Electrode, the Mig gun tip remains cool and does not overheat. You will have to cut just one white cable tie, to get an extra inch or so of free Mig cable, so the thick copper Mig lead will reach accross to the terminal on the other side of the machine named negative. Stick the earth lead at the front in the positive terminal.
I did this on my Rossi 220bz mig welder.
http://www.weldequip.com/gasless-mig-wire.htm

pulling to many amps out of your house turn stuff of and dont run your welder so hot anythin your not useing turn off before welding

my dad has the same problem.he says it need an exciter.

You don't need an striker with a MIG welder just hook the ground cable to the base metal point the nozzle where you want to weld and pull the trigger and it will weld. Household current will run a MIG welder Take a look at the plug on the welder if it will pug into a 110v outlet you are all set, but most likely you will need a 220v outlet and maybe as much as an electric dryer type outlet. 

It takes a lot of practice to be a decent welder you also need to know what voltage and wire speed settings to use for a given thickness and type of material. 

You don't mention shielding gas, if you are using a flux core wire you don't need it, but if you are using regular wire you do. 

If I may make a suggestion, If you really want to learn how to weld, find a community college near you and take an introductory welding class. You will get a wealth of information and practice on different welding processes. The instructor will work with you and get you welding much better and faster than you will on your own. Most importantly you will get a lot of safety information.

This is a good introductory book:
http://www.amazon.com/Welders-Handbook-RevisedHP1513-Cutting-Oxyacetylene/dp/1557885133/ref=ntt_at_ep_dpt_1

Try replacing the circuit breaker. They can/do get weak and tend to trip before they actually reach the rated limit.

Give the whole welder a good cleaning and then look for a short to ground.

Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .

good grnd?