FEB 2026
Average Manual Welding Arc-On Time: 10 – 15% — Myth or Reality?
Short answer: yes, numerous studies and industry data confirm that under manual welding conditions (MIG/MAG/TIG), the average arc-on time — the actual time when the welding arc is burning — amounts to only about 10–15% of total working time. In practice, many companies report even 8–12% average arc-on time, while 20% is considered the upper limit for highly efficient manual welding operations [1][2].
Actual Arc-On Time in Manual Welding (MIG/MAG/TIG)
Many studies emphasize that the real time during which the welding arc is active in manual welding is extremely small relative to the full shift duration. For example, according to Miller Electric (USA), the arc burns on average only about 10% of working time in semi-automatic welding (GMAW) [1]. In other words, out of one hour, a welder is actively welding for approximately six minutes. This is also confirmed by training materials from North American technical schools: “on average, arc-on time is 10–12% of the manual welding process” [3].
Even in manufacturing environments, managers often overestimate this metric. An article by an ESAB expert notes that many factories assume welding occupies a much larger portion of the shift, whereas in reality the arc burns only a few minutes per hour [2]. In high-performance manual MIG processes, the maximum arc factor is around 20%, strong performance is approximately 15%, and in many shops the actual range is only 8–12% [2]. In other words, 20% arc-on time represents the practical upper limit for manual welding, achievable only with highly optimized workflow organization. A more typical scenario is that the arc is active for roughly one- tenth of total working time.
The Finnish heavy machinery company Särkinen, after implementing ESAB’s monitoring system across 20 welding stations, discovered that average arc-on time was only 8–10%. Even after optimization, they were able to raise it only to approximately 20%, which ESAB describes as “practically the maximum achievable in manual MIG/MAG welding” — more than twice the industry average [4].
It should be noted that theoretically, arc-on time may vary significantly depending on the nature of the work. According to the British Welding Institute (TWI), for manual semi-automatic MIG/MAG welding in shop conditions, the “duty cycle” (proportion of time spent depositing weld metal) is typically around 45%, with a range of 15% to 60% [5]. However, such high values (40– 60%) are achievable only in perfectly organized mass-production environments with minimal interruptions. In real-world operations involving small-batch production and variable product geometries, actual performance tends to be near the lower bound of this range — around 15% or below.
Specialists from the American Welding Society note that “rarely does a welder keep the arc active for more than four hours per shift; 3–4 hours of pure arc time in an 8-hour day is already very good,” and in many cases about 15 minutes of arc per hour (~25%) is considered a strong result [6], while real shop-floor measurements often show less than 15%.
Even in manufacturing environments, managers often overestimate this metric. An article by an ESAB expert notes that many factories assume welding occupies a much larger portion of the shift, whereas in reality the arc burns only a few minutes per hour [2]. In high-performance manual MIG processes, the maximum arc factor is around 20%, strong performance is approximately 15%, and in many shops the actual range is only 8–12% [2]. In other words, 20% arc-on time represents the practical upper limit for manual welding, achievable only with highly optimized workflow organization. A more typical scenario is that the arc is active for roughly one- tenth of total working time.
The Finnish heavy machinery company Särkinen, after implementing ESAB’s monitoring system across 20 welding stations, discovered that average arc-on time was only 8–10%. Even after optimization, they were able to raise it only to approximately 20%, which ESAB describes as “practically the maximum achievable in manual MIG/MAG welding” — more than twice the industry average [4].
It should be noted that theoretically, arc-on time may vary significantly depending on the nature of the work. According to the British Welding Institute (TWI), for manual semi-automatic MIG/MAG welding in shop conditions, the “duty cycle” (proportion of time spent depositing weld metal) is typically around 45%, with a range of 15% to 60% [5]. However, such high values (40– 60%) are achievable only in perfectly organized mass-production environments with minimal interruptions. In real-world operations involving small-batch production and variable product geometries, actual performance tends to be near the lower bound of this range — around 15% or below.
Specialists from the American Welding Society note that “rarely does a welder keep the arc active for more than four hours per shift; 3–4 hours of pure arc time in an 8-hour day is already very good,” and in many cases about 15 minutes of arc per hour (~25%) is considered a strong result [6], while real shop-floor measurements often show less than 15%.
[6] Arcing Time of electrodes https://app.aws.org/forum/topic_show.pl?tid=35412
Thus, data from various sources converge: the typical arc-on time range in manual welding is 10– 20%, with values closer to 10% being more common in small-batch production or complex large- scale fabrication. A 20% figure corresponds to the upper boundary achievable only with highly optimized organization.
Why Does the Arc Burn Only 10–15% of the Time in Manual Welding?
The primary reason for low arc-on time in manual MIG/MAG/TIG processes is that manual welding includes numerous non-arc operations. Below are the key factors explaining why welders spend up to 80–90% of their time on auxiliary work rather than actual welding:
Preparation of Parts and Tooling. Before striking the arc, welders spend time assembling components, tack welding, positioning, aligning, and clamping parts. Joint fit- up and securing fixtures are necessary steps but occur without active welding. Poor fit-up further reduces efficiency, as excessive gaps or misalignments require additional corrective passes and adjustments. ESAB notes that waiting for proper positioning (for example, waiting for a crane to rotate a large component) and fit-up issues are common “hidden bottlenecks” reducing arc-on time [2]. The more complex and variable the product, the larger the share of time spent preparing it for welding.
Positioning and Repositioning During Welding. In manual welding, operators frequently reposition themselves or the part to access different seams, especially when working with large or heavy structures that require crane handling. All such movements occur with the arc off. Unlike systems equipped with positioners, manual welding cannot maintain continuous deposition, as each completed seam requires repositioning or part replacement, reducing overall arc utilization.
Pre-Weld Preparation and Post-Weld Processing. Surface preparation — including cleaning, degreasing, preheating, and applying anti-spatter — consumes significant time before welding begins, and additional interruptions may occur for adjustments during the process. Miller Electric emphasizes that arc-on time does not include time spent on fit-up, preparation, or post-weld grinding and cleaning, although these activities substantially extend total cycle time [7].
Consumable Changes and Equipment Maintenance. Manual welding requires periodic consumable changes and equipment maintenance, including electrode or wire replacement and gas supply adjustments. Troubleshooting issues such as wire feeding
problems further reduces productive arc time, as industry experts note [8]. In addition,
routine breaks and human fatigue naturally limit effective arc utilization.
Multi-Pass Welding and Quality Control. In shipbuilding or bridge fabrication, large welds require multiple passes. Between layers, slag removal, temperature checks, cooling intervals, and inspections are required. These process-driven pauses reduce active welding time. A welder may weld for several minutes, then spend 10–15 minutes on related operations.
Product Variability and Re-Setup. In small-batch production, frequent parameter
and tooling adjustments for varying materials and geometries reduce continuous arc time.
While manual welding offers flexibility, that adaptability comes at the cost of additional
setup time.
Waiting Time and Operational Downtime. In production environments, welders often wait for assembly completion, crane repositioning, adjacent trades, or quality approval before proceeding. In manual operations — particularly with large structures — some desynchronization is unavoidable, as welders depend on external handling and coordination. Jeff Chittim (ESAB) notes that bottlenecks reducing arc-on time are often hidden — for instance, a welder standing idle while waiting for a crane to move a component [9]. Collectively, these organizational pauses significantly reduce arc utilization.
Preparation of Parts and Tooling. Before striking the arc, welders spend time assembling components, tack welding, positioning, aligning, and clamping parts. Joint fit- up and securing fixtures are necessary steps but occur without active welding. Poor fit-up further reduces efficiency, as excessive gaps or misalignments require additional corrective passes and adjustments. ESAB notes that waiting for proper positioning (for example, waiting for a crane to rotate a large component) and fit-up issues are common “hidden bottlenecks” reducing arc-on time [2]. The more complex and variable the product, the larger the share of time spent preparing it for welding.
Positioning and Repositioning During Welding. In manual welding, operators frequently reposition themselves or the part to access different seams, especially when working with large or heavy structures that require crane handling. All such movements occur with the arc off. Unlike systems equipped with positioners, manual welding cannot maintain continuous deposition, as each completed seam requires repositioning or part replacement, reducing overall arc utilization.
Pre-Weld Preparation and Post-Weld Processing. Surface preparation — including cleaning, degreasing, preheating, and applying anti-spatter — consumes significant time before welding begins, and additional interruptions may occur for adjustments during the process. Miller Electric emphasizes that arc-on time does not include time spent on fit-up, preparation, or post-weld grinding and cleaning, although these activities substantially extend total cycle time [7].
Consumable Changes and Equipment Maintenance. Manual welding requires periodic consumable changes and equipment maintenance, including electrode or wire replacement and gas supply adjustments. Troubleshooting issues such as wire feeding
problems further reduces productive arc time, as industry experts note [8]. In addition,
routine breaks and human fatigue naturally limit effective arc utilization.
Multi-Pass Welding and Quality Control. In shipbuilding or bridge fabrication, large welds require multiple passes. Between layers, slag removal, temperature checks, cooling intervals, and inspections are required. These process-driven pauses reduce active welding time. A welder may weld for several minutes, then spend 10–15 minutes on related operations.
Product Variability and Re-Setup. In small-batch production, frequent parameter
and tooling adjustments for varying materials and geometries reduce continuous arc time.
While manual welding offers flexibility, that adaptability comes at the cost of additional
setup time.
Waiting Time and Operational Downtime. In production environments, welders often wait for assembly completion, crane repositioning, adjacent trades, or quality approval before proceeding. In manual operations — particularly with large structures — some desynchronization is unavoidable, as welders depend on external handling and coordination. Jeff Chittim (ESAB) notes that bottlenecks reducing arc-on time are often hidden — for instance, a welder standing idle while waiting for a crane to move a component [9]. Collectively, these organizational pauses significantly reduce arc utilization.
Conclusion
All of the above explains why manual MIG/MAG/TIG welding achieves only 10–15% arc-on time in practice. In essence, welders spend most of their working day on preparation, positioning, adjustments, and auxiliary tasks rather than active welding. For comparison, automated welding significantly increases arc-on time. Robots or automated systems can weld continuously for extended periods. For example, TWI cites a typical duty cycle of approximately 90% for automatic MIG/MAG welding [5]. This structural difference explains the global shift toward automation and robotic welding, which enable higher arc-on time even in low-volume environments by removing human-driven interruptions from the process.
The objective of this analysis is to highlight a common managerial blind spot: arc-on time is frequently overestimated. In many facilities, it is assumed that welders are actively welding for a large portion of the shift. Measured data often tells a different story.
Productivity discussions should begin with realistic metrics rather than assumptions. Once arc utilization is understood objectively, manufacturers are better equipped to evaluate how their welding operations are structured — and where meaningful improvements in output and predictability can be achieved.
The objective of this analysis is to highlight a common managerial blind spot: arc-on time is frequently overestimated. In many facilities, it is assumed that welders are actively welding for a large portion of the shift. Measured data often tells a different story.
Productivity discussions should begin with realistic metrics rather than assumptions. Once arc utilization is understood objectively, manufacturers are better equipped to evaluate how their welding operations are structured — and where meaningful improvements in output and predictability can be achieved.
Sources
[1][7][8] What Is Welding Arc-on Time and Are You Overestimating It? | MillerWelds https://www.millerwelds.com/resources/article-library/what-is-welding-arc-on-time-and-are-you- overestimating-it [2][9]
Tips to Improve Welding Efficiency and Reduce Costs | Fabricating & Metalworking https://fabricatingandmetalworking.com/tips-to-improve-welding-efficiency-and-reduce-costs/ [3]
Welding Technician Training Articles | NATS | Trade School https://nats.ca/Home/NewsArticle/tag/welding-technician-training/page/2/
[4] How to Use Data to Optimize Your Company's Welding Process - ESAB https://esab.com/eg/mea_en/esab-university/articles/how-to-use-data-to-optimize-your-companys- welding-process/
[5] What typical duty cycles are achieved when arc welding? - TWI https://www.twi-global.com/technical-knowledge/faqs/faq-what-typical-duty-cycles-are-achieved- when-arc-welding
[6] Arcing Time of electrodes https://app.aws.org/forum/topic_show.pl?tid=35412
Tips to Improve Welding Efficiency and Reduce Costs | Fabricating & Metalworking https://fabricatingandmetalworking.com/tips-to-improve-welding-efficiency-and-reduce-costs/ [3]
Welding Technician Training Articles | NATS | Trade School https://nats.ca/Home/NewsArticle/tag/welding-technician-training/page/2/
[4] How to Use Data to Optimize Your Company's Welding Process - ESAB https://esab.com/eg/mea_en/esab-university/articles/how-to-use-data-to-optimize-your-companys- welding-process/
[5] What typical duty cycles are achieved when arc welding? - TWI https://www.twi-global.com/technical-knowledge/faqs/faq-what-typical-duty-cycles-are-achieved- when-arc-welding
[6] Arcing Time of electrodes https://app.aws.org/forum/topic_show.pl?tid=35412
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