KR 120 R3900-2 K vs Smart Robotic Welding
Side-by-side comparison of KR 120 R3900-2 K (KUKA Robotics) and Smart Robotic Welding (Fronius) — specs, pricing, Robo Score, and verified deployments. Updated daily.
Optimize comparison for buyer
Optimized for Last-Mile Delivery buyers. Priority specs lifted to the top and marked with a target.
Layer 1: Identity & Trust
Manufacturer Country
- KR 120 R3900-2 KGermany
- Smart Robotic WeldingAustria
Year First Available
- KR 120 R3900-2 K2015
- Smart Robotic Welding2023
Verified Deployments
- KR 120 R3900-2 K0 Deployments
- Smart Robotic Welding0 Deployments
Layer 2: Operational
Price
- KR 120 R3900-2 K$19,000–$84,900 USD
- Smart Robotic WeldingContact for quote
Availability Status
- KR 120 R3900-2 KACTIVE
- Smart Robotic WeldingACTIVE
Arm Mechanics
Payload
- KR 120 R3900-2 K146 kg
- Smart Robotic Welding—
IP Rating (Arm)
- KR 120 R3900-2 KIP65
- Smart Robotic Welding—
Reach
- KR 120 R3900-2 K3,904 mm
- Smart Robotic Welding—
Degrees of Freedom
- KR 120 R3900-2 K6
- Smart Robotic Welding6
Repeatability
- KR 120 R3900-2 K±0.04 mm
- Smart Robotic Welding—
Robot Weight
- KR 120 R3900-2 K42 kg
- Smart Robotic Welding—
IP Rating (Wrist)
- KR 120 R3900-2 KIP67
- Smart Robotic Welding—
Performance
Duty Cycle
- KR 120 R3900-2 K—
- Smart Robotic Weldingcontinuous 24 7
Controller & Programming
Controller Model
- KR 120 R3900-2 KKR C5, KR C5 micro
- Smart Robotic WeldingHMI-T21 RS
Programming Languages
- KR 120 R3900-2 K—
- Smart Robotic WeldingTP/KAREL
Teach Pendant Type
- KR 120 R3900-2 K—
- Smart Robotic Weldingwired touch
Offline Programming
- KR 120 R3900-2 K—
- Smart Robotic WeldingFronius Pathfinder
Digital Twin Support
- KR 120 R3900-2 K—
- Smart Robotic WeldingYes
Connectivity
ROS-Industrial Support
- KR 120 R3900-2 K—
- Smart Robotic Weldingnone
IoT / Cloud Platform
- KR 120 R3900-2 K—
- Smart Robotic WeldingFronius SmartManager, WeldConnect
Predictive Maintenance
- KR 120 R3900-2 K—
- Smart Robotic Weldingnone
End-Effector
Tool Changer (ISO)
- KR 120 R3900-2 K—
- Smart Robotic Weldingother
Internal Cable Routing
- KR 120 R3900-2 K—
- Smart Robotic Weldingthrough arm and wrist
Pneumatic Lines
- KR 120 R3900-2 K—
- Smart Robotic Welding2
Electrical Lines
- KR 120 R3900-2 K—
- Smart Robotic Welding32
Commercial
Price (USD)
- KR 120 R3900-2 K$19,000–$84,900 USD
- Smart Robotic WeldingContact for quote
Warranty
- KR 120 R3900-2 K2 yrs
- Smart Robotic Welding—
Service Network
- KR 120 R3900-2 Kglobal
- Smart Robotic Weldingglobal
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | Germany | Austria |
| Year First Available (values differ) | 2015 | 2023 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | $19,000–$84,900 USD | Contact for quote |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Arm Mechanics | ||
| Payload (priority for Last-Mile Delivery buyers) (values differ) | 146 kg | — |
| IP Rating (Arm) (priority for Last-Mile Delivery buyers) (values differ) | IP65 | — |
| Reach (values differ) | 3,904 mm | — |
| Degrees of Freedom | 6 | 6 |
| Repeatability (values differ) | ±0.04 mm | — |
| Robot Weight (values differ) | 42 kg | — |
| IP Rating (Wrist) (values differ) | IP67 | — |
| Performance | ||
| Duty Cycle (values differ) | — | continuous 24 7 |
| Controller & Programming | ||
| Controller Model (values differ) | KR C5, KR C5 micro | HMI-T21 RS |
| Programming Languages (values differ) | — | TP/KAREL |
| Teach Pendant Type (values differ) | — | wired touch |
| Offline Programming (values differ) | — | Fronius Pathfinder |
| Digital Twin Support (values differ) | — | Yes |
| Connectivity | ||
| ROS-Industrial Support (values differ) | — | none |
| IoT / Cloud Platform (values differ) | — | Fronius SmartManager, WeldConnect |
| Predictive Maintenance (values differ) | — | none |
| End-Effector | ||
| Tool Changer (ISO) (values differ) | — | other |
| Internal Cable Routing (values differ) | — | through arm and wrist |
| Pneumatic Lines (values differ) | — | 2 |
| Electrical Lines (values differ) | — | 32 |
| Commercial | ||
| Price (USD) (values differ) | $19,000–$84,900 USD | Contact for quote |
| Warranty (values differ) | 2 yrs | — |
| Service Network | global | global |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Battery / Shift Runtime, Path Accuracy, Max TCP Speed, Cycle Time (25/305/25), MTBF, Vibration Damping, Safety Category, Dual Check Safety, Safety I/O Pairs, E-Stop Response, Safe Zone Count, Communication Protocols, Cybersecurity Certs, Tool Flange Standard, Spare Parts Lead Time, Expected Service Life
ROI Comparison
Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.
Annual labor displaced (per robot): $50,000
| Metric | KR 120 R3900-2 K | Smart Robotic Welding |
|---|---|---|
| Investment | $51,950 | No price |
| Payback period | 12.5 mo | — |
| Net savings (5 yr) | $198,050 | — |
| ROI (5 yr) | +381% | — |
Smart Robotic Welding has no listed price, so payback can't be computed. Contact the manufacturer for a quote.
Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.
Trade-offs at a glance
Frequently asked
Who makes KR 120 R3900-2 K and Smart Robotic Welding?
KR 120 R3900-2 K is made by KUKA Robotics, based in DE. Smart Robotic Welding is made by Fronius, based in AT.
When were KR 120 R3900-2 K and Smart Robotic Welding launched?
KR 120 R3900-2 K launched in 2015. Smart Robotic Welding launched in 2023.
How do KR 120 R3900-2 K and Smart Robotic Welding compare on the Robo Score?
KR 120 R3900-2 K scores 78.0 on the Robo Score. Smart Robotic Welding scores 55.7. The Robo Score is a 0–100 credibility figure blending commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
Are KR 120 R3900-2 K and Smart Robotic Welding in the same category?
Both robots are classified as Industrial Arm on Robolist. Filters and ranking treat them as direct alternatives.
What is the realistic total cost of ownership for Industrial Arm robots?
Hardware cost is one input. Industrial Arm TCO also includes integration, training, downtime, and end-of-life. Our breakdown: TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming.
What should a buyer ask vendors when choosing between KR 120 R3900-2 K and Smart Robotic Welding?
Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Industrial Arm Vendor Selection: Capability Matrices and Proof Points.
Going deeper — picking the right robot
TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming
7 min readIndustrial Arms
Industrial Arm Vendor Selection: Capability Matrices and Proof Points
9 min readIndustrial Arms
Programming Approaches: Teach Pendant, Offline, AI-Assisted — What Each Costs You
8 min readIndustrial Arms
Build vs buy vs lease: which model fits a first deployment
8 min readChoosing Your First Robot
The hidden specs vendors hope you'll miss
10 min readReading the Spec Sheet
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About this comparison
KR 120 R3900-2 K vs Smart Robotic Welding compares two robots in the industrial-arm category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Score is calculated.