My GF father is a welder before in Philippines and currently working in Saudi as welder.
He is not graduate in vacational or college only had High School Diploma.
Is he possible can apply his PR?
If he has enough points for FSW, he can apply. If he doesn't, he'd need to try to get an AEO and apply under a PNP or come in with an LMO and temporary work permit.
http://www.workdestinations.org/home.jsp?lang=en if you look for welder will show you requirements in different provinces. I have heard that in AB, they can get a work permit but need to pass a test within 6 months.