5 simple steps to reduce welding costs

Welding, especially the MIG/MAG (GMAW) and flux-cored (FCAW) processes that account for around 60% of the welds made daily in industry, is often treated as an unavoidable cost centre. In practice, the absence of technical control and a poor command of the processes and consumables turn welding into one of the biggest sources of financial loss in metalworking companies.

Global studies indicate that losses from low deposition rates, rework and oversized welds run into billions per year. Yet when it is handled on the basis of engineering and process control, welding stops being a black hole and becomes a direct source of profit. Implementing a rigorous welding management system can generate average savings of BRL 75,000 to 125,000 per welder per year.

Those results are only achievable when the process variables are known, measured and controlled. Below are the five fundamental steps to reduce cost and maximise productivity, focused on eliminating waste and making results predictable. All figures are in Brazilian reais (BRL).

1. Reduce weld volume - eliminate excess weld metal

The first and fastest route to savings is reducing the volume of deposited metal. Welds oversized by engineering, or excess weld metal laid down by welders, are among the most recurrent problems in industry: on average, welds are made with 50% to 100% excess material. If the design specifies a 5 mm fillet and the welder lays down 6 mm, that is 44% excess weld metal.

The financial consequence is significant. That difference feeds straight into higher wire, gas and energy consumption and, above all, welding time, which drives the total cost per kilogram deposited.

A practical example: an operation with five welders applying 44% excess weld metal (6 mm fillets where 5 mm is specified) generates an estimated annual waste of BRL 455,000, counting material and man-hours alone. Of that, approximately BRL 390,000 is direct labour cost spent on unnecessary welding.

Recommended actions:

• Design engineering should determine the correct fillet size by structural calculation, with no empirical margin.
• Dimensional control of welds should be routine. Provide fillet gauges to inspectors and welders to confirm conformity.
• Implement training and inspections to monitor excess weld metal on a sampling basis.

2. Maximise the deposition rate (kg/h) and optimise parameters

The second step is to reduce arc time per joint by increasing the deposition rate, expressed in kg/h. Management needs to know the theoretical deposition capacity of each welder.

Wire selection: wire diameter is a determining factor. For carbon steels above 5 mm thick, 1.2 mm and 1.32 mm wires are the most economical, giving a better cost-to-output ratio (BRL per kg deposited) than smaller diameters.

Simply increasing wire feed speed can cut welding costs by 20% to 60%, provided voltage and stick-out are adjusted appropriately.

A real cost example: an operator using 0.8 mm wire inefficiently can incur a cost of BRL 166/kg of deposited metal. With optimised parameters that can fall to BRL 115/kg at the same quality. With 1.2 mm wire it can fall to BRL 65/kg.

The clock method: the “clock rule” is a simple way to standardise parameters. For 1.2 mm wire, spray transfer typically occurs between the 12 o’clock and 3 o’clock positions on the wire feeder potentiometer of conventional feeders, with 1 o’clock (420 ipm / 1 m/min) the ideal starting point. Voltage should be adjusted until the arc produces a continuous, smooth sound without excessive crackling.

Mechanised and robotic welding: increasing stick-out (electrode extension) to 18-32 mm allows higher deposition rates without raising the current, and extends contact tip life, reducing stoppages and maintenance cost.

3. Raise the operating factor: arc-on time

The operating factor is the time actually spent welding, rather than moving, cleaning or waiting. In manual welding it averages 5% to 30%.

Raising the operating factor by just 5 percentage points (e.g. from 15% to 20%) produces a 25% productivity gain. In practice that means BRL 50,000 a year saved per welder, with no additional equipment investment.

How to raise the operating factor:

• Eliminate waiting for parts, tooling or instructions (see step 5).
• Organise material flow and consumable supply close to the welding station.
• Increase the degree of mechanisation/automation, for example replacing semi-automatic welding with tractor units or part rotation fixtures.
• Make sure the welder has technical support (WPS and welding control sheets) and standardised documentation, avoiding unproductive time spent on doubts or empirical adjustment.

4. Cut rejects, rework and scrap

Rework is one of the most expensive forms of waste in manufacturing. Every hour spent correcting a defective weld is an hour not spent on new production - and removing a weld and redoing it takes twice the time, meaning twice the cost. Beyond the direct cost, rework affects schedules, reliability and traceability.

Spatter and cleaning: spatter is a symptom of incorrect parameters, not an inherent characteristic of the MIG/MAG process. Many companies assign operators exclusively to spatter removal, which represents BRL 100,000 to 150,000 a year per employee.

Causes and technical solutions:

1. Incorrect parameters: voltage below the ideal causes instability. Adjusting voltage is the first step. Small adjustments of 0.5 V up or down can resolve the problem.
2. Inadequate gas mixture (MIG/MAG): using pure CO₂ increases spatter and reduces stability above 3 mm thickness. Mixtures of argon + 15-20% CO₂ give better quality and less cleaning. For very thin material (below 2 mm), use less than 15% CO₂.
3. Procedures and training: all these variable changes should be made through qualified WPSs, followed by properly trained welders.
4. Dilution and welding energy control: keeping heat input within the recommended range avoids cracking and metallurgical failure, reducing repair rates.

5. Cut operational waste: waiting, movement and layout

Much of the unproductive time in welding is outside the arc. Waiting for parts, unnecessary movement and poorly planned layouts consume energy, time and productivity.

Layout and movement: every unnecessary movement by the welder is cost. Simply eliminating 5 minutes of walking per part in a production run of 12,000 units a year can save more than BRL 17,000 a year.

Fit-up and assembly: errors in part fit-up and alignment rework (hammering, grinding) are major culprits. In one real case, 8 extra minutes per part due to poor fit-up generated an annual cost of BRL 65,000. Using fixtures designed by process engineering removes those bottlenecks.

Preventive maintenance and consumables: frequent changes of contact tips, nozzles and diffusers create unnecessary stoppages. A cheap contact tip can stop a robotic cell for 30 minutes. The answer lies in standardising stick-out, using quality consumables and following preventive maintenance routines.

Conclusion

Welding is essentially an applied science, not an empirical craft. The five steps described here - volume reduction, parameter optimisation, arc time management, rework elimination and operational efficiency - form a clear, measurable roadmap for turning welding cost into operating profit.

The real cost of welding is not in the price of wire, gas or energy, but in the total cost per kilogram of metal deposited to quality. Companies that adopt a welder-support philosophy, integrating design, manufacturing, quality and operations, achieve predictability, productivity and competitiveness.

When welding is handled on the basis of data, variable control and technical discipline, it stops being a cost centre and becomes a strategic asset for industrial profitability.

Need to put these strategies into practice?

Applying these steps efficiently demands technical vision and integration between engineering, fabrication and quality - something many companies still struggle to structure. If your business wants to reduce cost, improve its repair rate and raise the standard of welding and equipment fabrication quality, I can help.

Get in touch for a tailored assessment and technical support on process implementation, welding documentation, welder qualification and fabrication optimisation.

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