Product classification
HS code for Robotic resistance welder: 8515.21
Welding machines and apparatus, for resistance welding of metal, fully or partly automatic, whether or not capable of cutting.
Classification of robotic resistance welder under HS 8515.21
The classification of a robotic resistance welder under HS code 8515.21 is determined by its primary function as a specialized welding apparatus. According to the General Rules of Interpretation (GRI) 1 and 6, products are classified based on the terms of the headings and subheadings. Heading 8515 covers machines and apparatus for electric, laser, or other light or photon beam, ultrasonic, electron beam, magnetic pulse or plasma arc soldering, brazing or welding. Specifically, subheading 8515.21 is reserved for machines used for the resistance welding of metal that are fully or partly automatic. Even though the machine incorporates a robotic arm, Note 5 to Chapter 84 and the specific function rule dictate that a machine performing a specific function defined in a heading (welding) should be classified under that heading rather than as a general-purpose industrial robot. The automatic nature of the robotic system aligns perfectly with the requirement of this code for fully automated operations.
- Covers
- Robotic spot welding cells
- Automated resistance seam welders
- Robotic projection welding systems
- Multi-axis robotic arms with integrated resistance welding controllers
- Automated butt-welding robotic stations
- Also under 8515.21
- KUKA robotic welding systems
- FANUC resistance welding robots
- Fronius DeltaSpot welders
- ARO Technologies automatic welders
Codes often confused with 8515.21
Common mistake. A frequent error is classifying these machines under HS code 8479.50, which covers industrial robots not elsewhere specified or included. However, because the robot is dedicated to a specific function (welding) covered by heading 8515, the functional heading takes precedence. Another common mistake is using HS code 8515.31, which is reserved for arc welding machines. Resistance welding relies on heat generated by electrical resistance and pressure, whereas arc welding uses an electric arc to melt the metal; these are distinct technologies with separate subheadings.
Top exporters and importers of HS 851521 (the code used for robotic resistance welder), 2025
In 2025, the largest exporter of HS 851521 (the code used for robotic resistance welder) in UN Comtrade data was China, with 23% of world exports; the largest importer in UN Comtrade data was the United States, with 20% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 851521, not only robotic resistance welder.
Top exporters 2025 · share of world exports
- 1 China $331M 23% of world exports
- 2 Germany $251M 17% of world exports
- 3 Italy $142M 9.8% of world exports
World total: $1.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $266M 20% of world imports
- 2 Mexico $140M 10% of world imports
- 3 India $85M 6.3% of world imports
World total: $1.3B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for robotic resistance welder
Brazil classifies robotic resistance welder under NCM 8515.21.00: HS 8515.21 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about robotic resistance welder
What is the HS code for Robotic resistance welder?
The HS code for Robotic resistance welder is 851521 (Welding machines and apparatus; for resistance welding of metal, fully or partly automatic, whether or not capable of cutting). The correct HS code for a robotic resistance welder is 8515.21, which covers fully or partly automatic resistance welding machines for metal.
How do I classify Robotic resistance welder for customs?
Robotic resistance welder is classified under HS code 851521 — Welding machines and apparatus; for resistance welding of metal, fully or partly automatic, whether or not capable of cutting. This is a 6-digit subheading level code.
Does this code include the robotic arm if sold separately?
No, if a robotic arm is sold without the welding-specific end-effector or control software, it may be classified under 8479.50 as a multi-purpose industrial robot.
Which countries are the top exporters of robotic resistance welder (HS 851521)?
In 2025, the top exporters of HS 851521 (the code used for robotic resistance welder) in UN Comtrade data were China ($331M, 23% of world exports), Germany ($251M) and Italy ($142M). World exports came to about $1.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of robotic resistance welder (HS 851521)?
In 2025, the top importers of HS 851521 (the code used for robotic resistance welder) in UN Comtrade data were the United States ($266M, 20% of world imports), Mexico ($140M) and India ($85M). World imports came to about $1.3B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Robotic resistance welder the same in all countries?
The base HS code 851521 for Robotic resistance welder is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for robotic resistance welder in Brazil?
In Brazil, robotic resistance welder (HS 851521) is classified under NCM 8515.21.00.