(I) Solution Overview
The oil and gas pipeline welding solution addresses the harsh working conditions of onshore and offshore oil and gas pipeline construction and maintenance. It integrates high-power, high-stability engine-driven welding machines, pipeline-specific welding equipment, and auxiliary systems from Chongqing Lianwai Technology Co., Ltd., providing a comprehensive welding solution from pipeline prefabrication and on-site installation to post-construction maintenance. The solution boasts core advantages such as resistance to harsh environments, high-strength welding, and dual-station operation, meeting the high requirements of oil and gas pipeline welding for welding strength, sealing, and corrosion resistance, ensuring the long-term safe and stable operation of the pipeline system.

(II) Core Equipment Configuration
Pipeline-Specific Welding Main Unit
LWG600A Pipeline Welding Machine: Equipped with a 4-cylinder air-cooled engine, outputting AC230V/4Kw auxiliary power, with a welding current adjustment range of 30A-500A, suitable for welding oil and gas pipelines of different diameters and wall thicknesses; adopting a robust design, it adapts to complex environments such as outdoor, high-altitude, and low-temperature conditions.

WD600 600A Pipe Welding Machine: 600A welding current, 36kW rated power, 1500rpm diesel engine drive, powerful and meets the needs of high-strength pipe welding; supports single/dual-station welding, improving on-site work efficiency.

800A Oil and Gas Pipeline Welding Generator: Provides AC 40kW auxiliary power output, suitable for efficient welding of large oil and gas pipelines, and can also meet the power supply needs of other equipment on site, achieving multi-purpose functionality.

600A Deutz Air-Cooled Welding Generator: Specifically designed for the maintenance of offshore oil and gas drilling platforms, with excellent resistance to salt spray and moisture, ensuring stable welding in harsh offshore environments.

Multi-Process Welding Equipment: H400-Ⅱ 400A diesel engine driven multi-process welding machine and WD400-Ⅱ 400A dual-station pipe welding machine, supporting various welding processes such as manual arc welding, gas shielded welding, and flux-cored wire semi-automatic welding, adaptable to the welding needs of different parts of pipelines (joints, elbows, valves).

Auxiliary Equipment

GENWELD 110DPSC/141DPSC Diesel Mobile Screw Air Compressor: Provides stable compressed air, supporting gas supply for gas-shielded welding. 12.5-15 m³/min discharge capacity, 10-15 bar rated pressure, meeting the continuous air supply requirements of high-intensity welding; equipped with a Yuchai 118-140KW engine, meeting National IV emission standards, energy-saving and environmentally friendly.

Diesel Welding Generator (400A/600A Series): 80L large-capacity fuel tank, strong endurance, suitable for long-term field operations; provides AC400V/16Kw three-phase and AC230V/6.9Kw single-phase auxiliary power to meet on-site lighting, tool power supply, etc.

Welding Protection and Inspection Equipment: Suitable for outdoor operations, including anti-fall and waterproof welding masks, and pipeline weld flaw detection tools to ensure welding quality meets oil and gas pipeline industry standards.

(III) Core Technological Advantages

Powerful and Highly Adaptable: All equipment is powered by diesel engines, eliminating reliance on the power grid and making it suitable for remote onshore areas, offshore platforms, and other scenarios without electricity. The powerful engines can handle high-load welding operations, and the equipment exhibits excellent low-temperature start-up performance, adapting to working environments ranging from -20℃ to 50℃.

 High-Precision Welding Control: Welding current and voltage are continuously adjustable, covering a range of 30A-800A, precisely matching welding parameters for different pipe diameters (from small to large oil and gas pipelines) and materials (carbon steel, alloy steel, stainless steel). Digital control technology ensures a stable welding process, uniform weld formation, and weld joint strength exceeding that of the pipe base material.

Dual-Station and High-Efficiency Operation: Many models support simultaneous operation by two operators (e.g., the WD800 series 400Ax2 dual welding machine), significantly improving pipeline docking efficiency. The equipment is highly integrated and compact (e.g., some models have packaging dimensions of 1580x800x1050mm), facilitating on-site handling and installation. Safety and Durability: The equipment boasts an IP23 protection rating, providing dust and splash protection to withstand harsh outdoor conditions; its large fuel tank capacity (60L-80L) ensures long-lasting operation and reduces frequent refueling interruptions; it complies with oil and gas industry safety standards and features multiple protection functions including overload, overheating, and short-circuit protection.

(IV) Applicable Scenarios: On-site installation and welding of long-distance onshore oil and gas pipelines; Construction and maintenance welding of offshore oil and gas drilling platforms and subsea oil and gas pipelines; Prefabrication and installation welding of oil and gas storage tanks, pump station pipeline systems; Emergency welding operations during oil and gas pipeline repair and rerouting. (V) Service Guarantee

Customized Solution Design: Based on pipeline diameter, material, and operating conditions (onshore/offshore, temperature/humidity), we optimize welding processes and equipment configurations, providing integrated solutions combining prefabrication and on-site construction.

On-site Technical Support: We dispatch professional technicians to the site to guide welding operations, assist in resolving on-site process challenges, and ensure welding quality meets standards.

Equipment Operation and Maintenance Services: We provide regular equipment maintenance and fault repair services, establishing service points along oil and gas fields and pipelines for rapid response to maintenance needs.

Training and Certification: We provide training for customer operators on equipment use, welding processes, and safety regulations, ensuring operators are qualified for their positions.

Supply Chain Guarantee: We support bulk equipment procurement and emergency dispatch, providing comprehensive logistics solutions to ensure timely delivery of equipment to the site.

III. About Us
Chongqing Lianwai Technology Co., Ltd. is a professional manufacturer and exporter of welding machines, generator sets, motorcycles, tillers, and other products. We have a professional design team, advanced automated production workshops, and a strict quality control system. We have passed RoHS certification, credit verification, and supplier capability assessment. The company possesses capabilities in product research and development, customized production, and full-process service. We can optimize solutions based on customer needs and provide flexible trade and cooperation models.

Contact Information:
Phone/WhatsApp: 13696424316
Landline: 86-023-13696424316
Email: lianwai2020@gmail.com