Not really sure how this compares to the Welder version, since I haven't played that in months, but I enjoy playing my base-blue build if only for the ability to play with Brainstorm and Transmute Artifact. I'm no master with the deck, so the numbers could probably use a bit of tweaking.

Maindeck:
3 Kuldotha Forgemaster
4 Lodestone Golem
4 Metalworker
4 Wurmcoil Engine
2 Transmute Artifact
4 Grim Monolith
2 Lightning Greaves
2 Mox Diamond
3 Mox Opal
1 Staff of Domination
2 Voltaic Key
4 Ancient Tomb
4 City of Traitors
2 Island
4 Seat of the Synod
1 Academy Ruins
1 Blightsteel Colossus
1 Karn Liberated
3 Brainstorm
1 Inkwell Leviathan
4 Scalding Tarn
3 Phyrexian Metamorph
1 Ponder
SB: 1 Spine of Ish Sah
SB: 1 Phyrexian Metamorph
SB: 2 All Is Dust
SB: 4 Tormod's Crypt
SB: 4 Thorn of Amethyst
SB: 3 Trinisphere