OTC Robot

FD-B4S 7-Axis Professional Welding Robots

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OTC DAIHEN FD-B4S 7-Axis Industrial Robot

FD-B4S is a compact 7‑axis redundant robot from OTC DAIHEN, designed for precision welding and small‑part handling. It can freely change the robot posture while keeping the torch position and orientation unchanged – significantly improving reachability and obstacle avoidance in confined spaces. Welding cables are fully integrated inside the 7th axis mechanism, eliminating interference during teaching. Coordination technology simplifies the programming of this 7‑axis robot, making manual operation intuitive and efficient. With a 4kg payload and ±0.08mm repeatability, it is the ideal choice for precision manufacturing.

✨ Key Technology Advantages

7-axis redundancy — Maintains tool position/posture while flexibly adjusting robot pose; ideal for complex parts and narrow spaces.
Internal cabling in 7th axis — Welding cables completely hidden inside the 7th axis mechanism, zero interference with jigs/workpieces during teaching.
Coordinated teaching technology — Complex 7‑axis programming is greatly simplified with intuitive manual guidance.
High precision & rigidity — ±0.08mm repeatability, AC servo motors, absolute encoder feedback.
Lightweight compact design — 189kg robot weight, 2.57m² motion area, ideal for dense production lines.
Upper arm payload — 4kg additional load capacity for torches, sensors, grippers.

🔧 Primary Applications

Precision arc welding, spot welding, material handling, machine tending, assembly, dispensing, cutting assistance. The 7‑axis redundancy makes FD-B4S particularly suitable for electronic components, medical devices, instrumentation, small automotive parts, and any application requiring frequent obstacle avoidance.

📊 OTC DAIHEN FD-B4S Technical Specifications

* Refer to official OTC DAIHEN datasheet for full details.
Construction			Articulated
Number of axes			7
Max. payload			4kg
Repeatability			±0.08mm (Note 1)
Drive method			AC servo motor
Drive capacity			3550W
Position feedback			Absolute encoder
Working range	Basic axes	J1 (Rot.1)	±170°
		J2 (Fwd/Rev)	-145°~+70°
		J7 (Rot.2)	±90°
		J3 (Up/Down)	-170°~+142.6°
	Arm axes	J4 (Swivel)	±155°
		J5 (Bend)	-45°~+225° (Note 2)
		J6 (Twist)	±205° (Note 2)
Max. speed	Basic axes	J1 (Rot.1)	3.66 rad/s {210°/s}
		J2 (Fwd/Rev)	3.66 rad/s {210°/s}
		J7 (Rot.2)	3.14 rad/s {180°/s}
		J3 (Up/Down)	3.66 rad/s {210°/s}
	Arm axes	J4 (Swivel)	7.33 rad/s {420°/s}
		J5 (Bend)	7.33 rad/s {420°/s}
		J6 (Twist)	10.5 rad/s {600°/s}
Arm load capacity	Allowable torque	J4 (Swivel)	10.1 N·m
		J5 (Bend)	10.1 N·m
		J6 (Twist)	2.94 N·m
	Moment of inertia	J4 (Swivel)	0.38 kg·m²
		J5 (Bend)	0.38 kg·m²
		J6 (Twist)	0.03 kg·m²
Motion range area			2.57m² × 340°
Ambient conditions			Temp: 0~45℃, Humidity: 20~80%RH (non‑condensing)
Robot weight			189kg
Upper arm payload			10kg (Note 3)
Mounting			Floor (Note 4)
Color			White (Munsell 10GY9/1)

Note 1: Repeatability complies with JIS B 8432, measured at standard TCP.

Note 2: J6 working range may be restricted by J5 posture.

Note 3: Upper arm payload varies with total payload.

Note 4: For ceiling/side wall mounting, please consult our sales team.

🛒 Genuine OTC DAIHEN Parts · Professional Support

We are an authorized distributor of OTC DAIHEN welding & robotics, supplying 100% genuine spare parts. FD-B4S 7‑axis robots and consumables are available for order.

📞 Tel / Whatsapp/WeChat: +86 180-9663-1656

📧 Email: ahojotc@gmail.com
Over 10 years in welding automation — 7×12 hours online, add our WeChat for technical exchange.

Anhui Oujie Automation — OTC DAIHEN Official Sales & Service Partner