About WELONG

Established in 2001, Welong is a premier China Customs Class-A certified enterprise and a global supply chain leader dedicated to "Intelligent Manufacturing in China." With over 20 years of expertise and ISO 9001:2015 certifications, we specialize in delivering high-end, customized metal components across a vast industrial spectrum, including Petrochemical, Energy, Aviation & Medical, Shipbuilding, Automotive, Railroad Components, and General Machinery. Our core manufacturing encompasses various types of casting and advanced machining—utilizing precision manufacturing for superior performance in extreme environments, from the Middle East to the Pan-Russian region. Led by professional engineers, Welong ensures 100% compliance via strict inspection and global logistics. We prioritize customer value, delivering mission-critical solutions and punctual service to over 100 global partners.

Why Choose Us

We have been in the mechanical industry since 2001. We have invested in our own processing plants for metal spare parts used in different kinds of industries to meet our customer’s requirements.

20+ Years of Industry Expertise
ISO Certified Quality
Diverse Multi-Industry Manufacturing
Expert Engineering & Design Support
Full-Process Quality Control & Inspection
Global Logistics & Secure Packaging

OEM/ODM Service

We have always been committed to designing products and solutions that improve people's quality of life.

Forging

Forging is a manufacturing process in which metal is heated and then hammered or pressed into shape. It can be divided into two categories: cold forging, which involves shaping the material at room temperature, and hot forging, More>

Sand Casting

Sand casting is a type of metal casting process that uses sand as the mold material. It's one of the most versatile and cost-effective processes for creating metal castings, and can be used to create parts in almost any shape or size.More>

Gravity Casting

Gravity casting is a manufacturing process that uses gravity to fill a mold with liquid metal. It is typically used for complex shapes and thin walls, and can be used to produce parts from aluminum, brass, bronze, and other metals. The process involves pouring molten metal into a pre-made mold or die, then allowing it to cool and solidify in the shape of the desired part. Gravity casting offers several advantages over other methods of metalworking, such as sand casting or die casting, including reduced labor costs, improved dimensional accuracy, and higher quality finished products.More>

Centrifugal Casting

Centrifugal casting is a method of casting molten metal into a mold that rotates at high speed. It is used to produce cylindrical parts with precise dimensions and uniform internal structures, such as pipes and tubes. The process begins by spinning the mold on an axle supported by bearings while liquid metal is poured in through an opening at the top. As it cools, the centrifugal force pushes the molten metal against the walls of the mold, creating a strong bond between them.More>

Die Casting

Die casting is a manufacturing process that involves the use of molten metal, which is injected under high pressure into a mold cavity. The resulting parts can have complex shapes and excellent surface finishes. Die casting is used to produce components for many industries, including automotive, electronics, and medical devices.More>

Investment Casting

Investment casting is a manufacturing process in which a wax pattern is coated with a refractory material. The pattern is then heated to melt the wax, leaving behind an empty cavity in the shape of the desired part. Molten metal is then poured into this cavity and allowed to cool and solidify. Once cooled, the ceramic shell surrounding the newly formed metal part can be broken off, leaving behind a near-net-shape cast component that only requires minimal finishing operations.More>

Machined Parts

Backed by 20+ years of expertise and ISO 9000 certification, China Welong delivers high-precision machined parts tailored to diverse industrial needs. By combining state-of-the-art technology with a customer-centric approach, we provide cost-effective, precision-engineered components that meet the most rigorous standards of accuracy and performance across the automotive, aerospace, and medical sectors.More>

Markets

Since the establishment, we are offering Supplier Development & Management, Purchasing Supervising, Quality Control services in China for many leading enterprises in the fields of International Industrial Manufacture, Oil Drilling, Aerospace & High-end Medical Treatment.