Four-machine collaborative welding of construction machinery longitudinal beams
SERVICE HOTLINE
Details
The longitudinal beam of construction machinery is the core load-bearing main beam of the undercarriage for equipment such as loaders, excavators, road rollers, and bulldozers. It withstands high‑intensity loads arising from the machine’s total weight, travel impacts, torsional shear, and operational vibrations, serving as a critical structural component that ensures overall rigidity, driving stability, and operational safety. The four‑machine collaborative welding process for construction‑machinery longitudinal beams is an automated, synchronous welding solution specially developed for ultra‑long, heavy, large‑span beam structures. It comprehensively addresses longstanding industry challenges—including uneven heat distribution in conventional single‑machine, single‑side welding; asymmetrical welds on both sides; beam distortion and deformation; concentrated residual stresses; low welding efficiency; and high rework rates—making it the cornerstone technology for high‑quality, standardized, and highly efficient mass production of chassis beams in the construction‑machinery sector.
This process employs a four-robot synchronous collaborative welding configuration, with bidirectional, symmetrical operations on both sides, enabling the simultaneous formation of longitudinal beam welds—both internal and external surfaces, with double‑V grooves and double‑sided seams. It is compatible with a wide range of longitudinal beam materials, including high‑strength steels for construction machinery, thick structural steels, and wear‑resistant steel plates. The system comprehensively addresses all processing requirements, from mass‑production welding of new chassis longitudinal beams to forming and welding extended beams, reinforcing cracked existing beams, remanufacturing and repairing welds, and performing structural reinforcement welds. It is also well suited for precision welding of main beams, sub‑beams, cross members, and load‑bearing frames in engineering vehicle chassis across various tonnage classes.
Leveraging a four‑machine coordinated synchronous control system, this process achieves trajectory coordination, velocity synchronization, and balanced heat input across multiple robots. Employing symmetrical multi‑layer, multi‑pass welding, segmented backstep welding, and full‑groove welding techniques, it ensures uniform heating on both sides of the longitudinal beam and mutual stress cancellation, thereby eliminating at the source common manufacturing issues such as side bending, distortion, warping, surface unevenness, and dimensional deviations. The welds exhibit consistent penetration depth, full, dense bead formation, and uniform, well‑defined microstructures, free from porosity, slag inclusions, lack of fusion, or cracks. Weld strength and toughness are perfectly matched to the base material, significantly enhancing the longitudinal beam’s overall resistance to torsion, fatigue, and heavy‑load impacts. This effectively prevents failures such as cracking, deformation, and misalignment that can occur during prolonged equipment operation, fully meeting the stringent load‑bearing requirements and rigorous nondestructive testing standards for construction machinery chassis.
Compared with the traditional single‑machine sequential welding and manual welding approaches, four‑robot collaborative synchronous welding boosts production efficiency by more than threefold. With a single clamping operation, dual‑side forming, no need for secondary flipping or repeated positioning, it significantly reduces clamping wait times and process‑handoff durations. The equipment supports program memory for one‑click reproduction, enabling standardized replication of welding parameters and delivering exceptionally high product consistency—completely addressing the challenges of inconsistent weld seams, substantial thermal distortion, and low first‑pass yield inherent in manual welding. Post‑welding, the longitudinal beam exhibits extremely low residual stress, eliminating the need for extensive correction, grinding, and reshaping operations, thereby effectively lowering consumable costs and labor‑intensive rework expenses. It is well suited to meet the demands of high‑volume, standardized mass production on factory assembly lines.
Leveraging its core advantages—dual-sided synchronous welding, zero distortion, balanced stress, high weld strength, rapid mass production, and a high nondestructive‑testing pass rate—the technology is widely employed in the welded fabrication of chassis longitudinal beams, frame main beams, and load‑bearing structural components for various types of construction machinery. It effectively enhances chassis structural stability and overall machine durability, helping manufacturers reduce costs, improve efficiency, and upgrade product quality, while providing robust structural‑welding assurance for long‑term, stable, and safe operation of engineering equipment.
Previous：
WELCOME TO CONSULT OUR PRODUCTS IN A TIMELY MANNER
CONTACT US
6th Floor, Workshop 3, Hongxiang Standard Factory Building, No. 2 Hongli Road, Nanning, Guangxi, China
