But Wales replaced their entire front row in the 60th minute and held on, scoring a fourth try through new fly-half Nicky Robinson, which was converted by fullback Gavin Henson, who finished with 15 points from the boot.
Williams scooted over for his first try in the 11th minute after a break by Charvis presented impressive centres Tom Shanklin and Sonny Parker with good ball to release the the winger into the corner. Williams doubled his tally five minutes later, side-stepping through the Argentinian midfield and turning full-back Hernan Senillosa to cross under the posts.
Argentinian lock Ignacio Lobbe was sinbinned in the 29th minute for infringing at a ruck. Henson chipped in with a penalty minutes later, and with half-time looming, Williams crossed for his hattrick after a break by scrumhalf Dwayne Peel. The home side started the second half with more fire, and with Charvis sinbinned for killing the ball, fullback Senillosa kicked Argentina's first points of the game. Replacement winger Federico Aramburu crossed under the posts two minutes later, and a successful conversion left the score at 25-10 to Wales. Big tighthead prop Omar Hasan then burrowed over from a ruck on the Welsh line.
With Argentina now within 10 points, new Wales coach Mike Ruddock replaced all his front row personnel, and was soon rewarded with a Henson penalty. Flyhalf Robinson crossed shortly after for his first international try, which was converted by Henson. Hattrick hero Williams was shown the yellow card on regulation full time for infringing at a ruck.
Argentina scored a late consolation try eight minutes into injury time through winger Lucas Borges. The conversion was missed and the score remained a convincing 35-20 win for Wales and tied 1-1 series.
Wales now travel on to South Africa where they take on the Springboks -- who beat Ireland also on Saturday to win their series 2-0 -- in Pretoria next Saturday.
Argentina go to New Zealand for a daunting test on the same day against the All Blacks in Hamilton.
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