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Gear for higher deposition & accurate IPM
Wire, machines that display feed rate clearly, and shop tools to verify material usage.
ER70S-6 MIG Wire (.035")
- Match spool size to calculated lb/hr jobs
- Stable arc for predictable feed-to-deposition
- Common shop diameter for structural steel
Lincoln Electric MIG 211i
- Clear wire-speed readout for IPM-based estimates
- Production-friendly Auto-Set workflows
- Dual voltage for shop flexibility
Yeswelder 7018 Electrode Pack
- Lower deposition processes—plan stick hours
- Structural low-hydrogen baseline
- Pair with efficiency % in the calculator
Complete TIG Consumables Kit
- Keep TIG runs efficient between torch setups
- Gas lenses and cups for steady arc time
- Supports precise low-deposition work
660 lb Digital Platform Scale
- Weigh spools to reconcile actual vs. theoretical lb/hr
- Heavy capacity for shop inventory checks
- Useful when tuning arc-on time assumptions
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What Is Weld Deposition Rate?
Weld deposition rate measures how much filler metal becomes actual weld metal per hour, typically expressed in pounds per hour (lbs/hr). This metric is crucial for job estimating, cost analysis, process comparison, and maximizing shop productivity.
Understanding your deposition rate helps you:
- Estimate jobs accurately – Know exactly how long projects will take
- Compare processes – Is MIG really faster than Stick for this job?
- Calculate costs – How much will filler metal cost?
- Track productivity – Are we maximizing our efficiency?
- Justify equipment – Will a high-deposition machine pay for itself?
Deposition Rate vs. Melt-Off Rate
- Melt-off rate = Total wire consumed per hour
- Deposition rate = Actual weld metal deposited per hour
The difference is your electrode efficiency—the percentage of wire that actually becomes weld metal. The rest is lost to spatter, slag, and fumes.
How to Calculate Weld Deposition Rate
Deposition Rate (lbs/hr) = Wire Feed Speed × Electrode Area × Material Density × Efficiency × 60
Breaking Down the Formula
1. Wire Feed Speed (WFS)
Measured in inches per minute (IPM). Most MIG welders display this on the machine.
- Light MIG welding: 100–200 IPM
- Production MIG: 300–500 IPM
- High-deposition: 500–800 IPM
2. Electrode Area
Cross-sectional area of your wire: π × (diameter/2)²
3. Material Density
- Steel: 0.283 lbs/in³
- Stainless Steel: 0.286 lbs/in³
- Aluminum: 0.098 lbs/in³
- Nickel Alloys: 0.323 lbs/in³
4. Electrode Efficiency
- SMAW (Stick): 65–75%
- FCAW (Flux-Core): 80–90%
- GMAW (MIG): 92–98%
- GTAW (TIG): 95–99%
- SAW: 95–99%
Real-World Example
Setup:
- Wire diameter: 0.045"
- Wire feed speed: 350 IPM
- Material: Carbon steel (0.283 lbs/in³)
- Process: MIG (95% efficiency)
Calculation:
- Electrode area = π × (0.045/2)² = 0.00159 in²
- Deposition rate = 350 × 0.00159 × 0.283 × 0.95 × 60
- Result: 8.95 lbs/hr
Understanding Arc-On Time
Arc-on time is the percentage of time actually welding versus positioning parts, changing spools, grinding, setup, breaks, and waiting for materials.
Typical Arc-On Times
- Shop fabrication: 20–30%
- Production line: 30–40%
- Pipe welding (field): 15–25%
- Automated/robotic: 60–80%
⚠️ Critical Reality Check: The industry average for manual welding is around 25% arc-on time. That means in an 8-hour shift, only 2 hours is actual welding.
Example: Realistic Shift Production
If your deposition rate is 8.95 lbs/hr:
At 25% arc-on time:
- 8 hours × 0.25 = 2 actual welding hours
- 8.95 × 2 = 17.9 lbs per shift
At 35% arc-on time:
- 8 hours × 0.35 = 2.8 actual welding hours
- 8.95 × 2.8 = 25.1 lbs per shift
Comparing Welding Processes
| Process | Deposition Rate | Best For |
|---|---|---|
| SMAW (Stick) | 1–5 lbs/hr | Field repairs, outdoors, dirty metal |
| GMAW (MIG) | 3–12 lbs/hr | Shop fabrication, production |
| FCAW (Flux-Core) | 4–15 lbs/hr | Structural steel, outdoor welding |
| SAW (Submerged Arc) | 15–50+ lbs/hr | Heavy plate, long seams, automation |
| GTAW (TIG) | 1–4 lbs/hr | Critical welds, thin material, stainless |
Factors Affecting Deposition Rate
1. Wire Diameter
Larger diameter wire significantly increases deposition rate. Moving from 0.035" to 0.045" increases rate by approximately 60% (all else equal).
2. Wire Feed Speed
Higher feed speeds increase deposition proportionally but require matching amperage.
3. Travel Speed
Faster travel = less deposition per inch. Slower travel = more deposition but risks excessive heat input and distortion.
4. Welding Position
- Flat (1G/1F): Highest deposition rates possible
- Horizontal (2G/2F): 10–20% slower than flat
- Vertical (3G/3F): 20–40% slower than flat
- Overhead (4G/4F): 30–50% slower than flat
How to Increase Shop Deposition Rate
1. Optimize Arc-On Time
Goal: Increase from 25% to 35% arc-on time = 40% more production with the same labor cost.
2. Upgrade to Higher-Deposition Processes
- Switch from Stick to MIG for shop work
- Use Flux-Core for field work instead of Stick
- Consider SAW for long seams and heavy plate
3. Use Larger Diameter Wire (When Appropriate)
Moving from 0.035" to 0.045" wire can increase deposition by 60%. Material must be thick enough (typically 3/16" minimum).
Estimating Job Costs with Deposition Rate
Project Requirements:
- Total weld metal required: 15 lbs
- Deposition rate: 8 lbs/hr (theoretical)
- Arc-on time: 25%
- Welder labor rate: $35/hr
- Wire cost: $2.00/lb
Calculation:
- Arc-on time: 15 ÷ 8 = 1.88 hours of welding
- Total labor time: 1.88 ÷ 0.25 = 7.5 hours
- Labor cost: 7.5 × $35 = $262.50
- Material cost: 15 × $2 = $30.00
- Gas cost: 7.5 hrs × 30 CFH × $0.30 = $67.50
- Total direct cost: $360.00
Frequently Asked Questions
What is a good deposition rate for MIG welding?
For production MIG with 0.045" wire, 8–12 lbs/hr is typical. High-deposition systems with larger wire can reach 15–25+ lbs/hr.
How does wire diameter affect deposition rate?
Wire diameter has a squared relationship with deposition rate. Moving from 0.035" to 0.045" wire increases cross-sectional area by 64%, which directly increases deposition rate by the same percentage.
Why is my actual production lower than calculated?
Arc-on time is almost always the culprit. Most shops only achieve 20–30% arc-on time due to handling, setup, breaks, electrode changes, and grinding.
What's realistic arc-on time for a fabrication shop?
Industry average is 20–30% for typical job shop fabrication. With good organization, 35–40% is achievable. Robotic systems can hit 60–80%.
Related Calculators
Conclusion
Understanding and optimizing weld deposition rate is one of the most effective ways to improve shop profitability. Use this calculator to bid jobs accurately, compare processes, set performance targets, and track improvement over time.
💡 Key Takeaway: A 10% improvement in arc-on time (from 25% to 35%) is equivalent to adding an extra welder to your shop—without the additional labor cost, benefits, or training time. Focus on maximizing productive welding time before investing in new equipment.