Is there a company that does MIG Welding supplies namely the gas, nationally in Spain?
In the UK I used “Argoshield” from BOC.

maybe you could order it online http://www.bocindustrialbook.co.uk/P...ef_1_5_4_4.htm

If you do a search for gases industriales in

http://www.paginasamarillas.es/

you should find a supplier in your area.

A search in Badajoz gave the following result :-

http://www.paginasamarillas.es/resul...adir&site=paol

We have also tried to find MIG gas here in Galicia. Finally found a supplier but they only do the very large industrial size bottles. The supplier we found is located in a hire shop, but we also asked at garages and it seems they have theirs supplied from an industrial supply specialist.
I doubt if BOC will find a service that will handle the gas form the U.K.
Now thinking about changing to arc as the supply of equipment and gasses is much easier to obtain.

At least in the Basque Country, I always saw a lot of Praxair tanks and bottles.

http://www.praxair.com/praxair.nsf/1...4?OpenDocument

Thanks for your advice folks.
I'll do some investigating and let you know the results.