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Geo-Tech Industries Inc. - Industrial Manufacturing and Installations
Introduction to Weld Overlay Procedures

We encompass S.M.A.W., G.M.A.W., F.C.A.W. and S.A.W. from manual to fully automatic with registered welding procedures.

  • All welding machines that require volt-amp monitoring will have calibrated gauges
  • Air conditioning is used to supply cool, clean air and remove smoke and fumes from vessel
  • All welders are job-tested to procedure as per A.S.M.E. code
  • All overlays shall have boat samples taken randomly, or a nuclear analyzer will be used to check chemical analysis

S.M.A.W. Example:

309L electrode used to achieve minimum 18-8 finished overlay with single pass. Beads will be 8 per vertical inch with 3/16" minimum build-up. Welding supervisor on a continuous basis monitors voltage and amperage. The overlay is checked for the right number of beads per inch and overlay thickness approximately every two hours for each welder.

G.M.A.W. Example:

"Inconel" automatic single pass overlay in vessel. Power is fed through slip ring device to rotary table having multiple heads spread equidistantly. The welding controls are located at each welding head. The indexing and travel are done automatically after checking and setting to vessel diameter. Vertical travel of 48" of overlay is applied. Then the table is raised as a unit with post support systems installed under the table at each lift with centering and clamping to the wall and starting next 48" of overlay.

Welding is done with dual gas shielding at 8 beads per vertical inch with minimum build-up of 3/16". Each welding head is operated by one man who monitors voltage, amperage and bead profile. With a three-man crew, this gives changeover time for lunch and coffee and supplies wire and checks gas cylinders without interrupting the welding operation.

To view G.M.A.W./ F.C.A.W. photo examples click here.

S.A.W. Example:

Geo-Clad 3-1a, powdered alloy core wire with subarc flux, single pass overlay giving an average 25% chrome and 11% nickel finished overlay. Power is fed through slip ring device to rotary table that has multiple welding heads spread equidistantly.

The welding controls are located at each welding head. The indexing and travel are done automatically after checking and setting to vessel diameter. Vertical travel of 48" of overlay is applied. Then the table is raised as a unit with post support systems installed under the table at each lift with centering and clamping to the wall and starting next 48" overlay.

Each welding head is operated by one man who monitors volts, amps, flux hopper and bead profile. With a three-man crew, this gives changeover time for lunch and coffee breaks and supplies wire and flux to table without interrupting the welding operation.

 

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