Deposition Rate

Raising Deposition Rate Without Buying Rework

Deposition rate is the throughput dial for a fab shop. How to raise it with process and parameter levers without buying overweld, defects, and rework.

In welding, labor and overhead run 70 to 85 percent of the cost of every foot of weld, and deposition rate is the denominator under all of it. A welder depositing 6 pounds an hour who moves to 9 finishes the same joint in two thirds of the arc time. On a crew of 12 at $70 per burdened hour, a 20 percent deposition gain that actually converts to finished work is worth $200,000 to $350,000 a year. That is why deposition rate is not a welding engineer's trivia number; it is the throughput dial for the entire fabrication shop.

The math starts at the wire feeder. Deposition equals wire feed speed times the wire's weight per inch times deposition efficiency. A 0.045 inch solid steel wire weighs about 0.00045 pounds per inch. At 350 inches per minute, the feeder pushes 9.4 pounds of wire per hour; in spray transfer at 93 percent efficiency, 8.8 pounds land in the joint. The Weld Deposition Rate calculator runs this from wire feed speed, wire weight factor, and efficiency, which makes it easy to check whether a proposed parameter change actually adds metal or just adds spatter.

Efficiency is where processes separate. Stick electrodes deposit 55 to 65 percent of what you buy after stub loss and slag. Gas-shielded flux-cored runs 80 to 88 percent. Solid wire MIG runs 88 to 93 in short circuit and 93 to 98 in spray. Metal-cored delivers 92 to 96, and submerged arc essentially 99 with flux recovery. Typical deposition ranges follow the same ladder: 2 to 5 pounds per hour for stick, 5 to 12 for solid wire MIG, 6 to 12 for semiautomatic flux-cored, and 15 to 40 for single wire submerged arc.

The levers, in order of leverage. Move up a wire size: 0.052 solid wire in the same application deposits 15 to 25 percent more than 0.035 at its usable current range. Get into spray or pulsed spray wherever position allows. Convert flux-cored fillet work to metal-cored and pick up 5 to 10 points of efficiency plus travel speed. Extend electrical stickout on cored wires from 0.75 to 1.0 inch for 10 to 15 percent more melt-off at the same current. And fixture work into the flat position, where welders run 2 to 3 times the travel speed they manage vertically.

The classic failure is buying deposition with overweld and defects. Crank wire feed speed without adjusting travel and the 1/4 inch fillet on the print becomes 5/16 on the part, which is 56 percent more metal, more distortion, and zero added strength the design asked for. Push deposition past the joint's heat input limits on quenched and tempered steels and you trade arc time for failed procedure qualifications. Every deposition initiative needs a fillet gauge audit riding alongside it: measure 20 welds per shift for two weeks, and most shops discover they were already overwelding 30 to 60 percent.

The second failure is confusing melted with deposited and deposited with shipped. A welder can deposit 9 pounds an hour and produce nothing sellable if the operating factor is 20 percent because parts, cranes, and grinding own the shift. Deposition rate times arc-on hours is what the joint receives, so track both. A shop that raises deposition 25 percent while arc-on time falls from 30 to 24 percent of the shift has bought new consumables and gained nothing. Fix material handling and fixturing in the same project or the deposition gain evaporates before it reaches the schedule.

Run it on a cadence. Weekly, pull pounds of wire issued per welder and arc-on hours from the power sources, then back-calculate actual deposition rate and compare it to the procedure's expectation; a welder 20 percent under is running short arc where spray was specified or living on the grinder. Monthly, audit parameters on the top 10 joints by volume and gauge fillet sizes against print. Quarterly, review one process conversion candidate with the full math: deposition rate, efficiency, wire price, gas cost, and the labor hours the change releases.

World class fab shops know deposition rate by welder, by procedure, and by week. They run spray or pulse everywhere position allows, hold fillet size within 1/16 inch of print on 90 percent of audited welds, and keep arc-on time above 40 percent through fixturing and material flow. When they quote, the deposition number in the estimate matches the demonstrated number on the floor, which is why their bids are tight and their margins are real.

Published 2026-07-02.