Welding

Shanghai Leierwo Industry & Trade Co., Ltd. provides professional welding mass production services, focusing on the connection and integration of high-quality, high-standard metal structural parts and complex components.

Welding is a crucial method, alongside casting and machining, for creating complex metal structures. It permanently connects separate metal parts through melting or plastic deformation to achieve specific structural functionality and strength requirements.
Our services extend beyond simple joining to include TUV-certified high-precision welding processes, assembly of complex structures, and structural reinforcement and repair for products subjected to extreme operating conditions (such as high temperature, high pressure, and severe corrosion). Leveraging our integrated industrial and commercial capabilities, we offer comprehensive, customized solutions, ensuring consistent product quality, reliable delivery schedules, and efficient global delivery.

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Our Core Welding Capabilities

Core Competencies	Description and Advantages
Tuv Certified Welding Process	Our TUV-certified welding process ensures that welding quality meets international standards. Key processes are performed by technicians with over 10 years of experience.
Complex Assembly And Integration	Focus on the precise assembly of multiple cast or machined components (such as pump and valve components) into complex final products to achieve functional integration.
Full Process Quality Control	There are 8 quality control nodes, covering from spectral testing of raw materials to non-destructive testing of finished products (such as PT/UT), ensuring that the qualified rate of products after welding reaches 99.5%.
Customized Production	It can flexibly meet the welding and assembly needs of single piece, small batch to large-scale batch production.

Wide Range of Applications and Core Products

Welding services are widely used in industrial fields that require high-strength connections and complex structural integration

Pumps, Valves and Connections：

Assemble complex pump bodies, valve bodies and flanges to meet the requirements of high temperature, high pressure and strong corrosion conditions.

General Castings：

Used for structural connection and reinforcement of large-sized or non-specific metal components such as construction machinery and marine parts.

Customized Structural Parts：

Produce a wide range of stainless steel castings, pipe fittings and structural parts to meet specific structural and dimensional requirements.

How The Production Process Works

We want to make working with us on a production project as smooth and streamlined as possible.

1

Speak with a manufacturing expert who will help you customize your production quote around a complete bill of materials.

2

Work with our team to optimize your project for production, including design for manufacturability and cost reduction options.

3

An initial sample run of the part is manufactured and sent to you to ensure the part meets your standards before full production begins.

4

Gain process transparency and quality control when full production begins.

5

Apply post-processing and final quality measures before parts are shipped.

6

Place subsequent batch production orders for your project at any time through our virtual warehouse.

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Start Your Project with Leierwo

1. Submit Your Inquiry

Send your CAD drawings and 3D files via email, specifying material grade, order quantity, surface finish, or any other relevant details.

2. Cost Calculation

Once we receive your design, our engineering team will carefully evaluate the drawings and calculate the price based on actual production costs as soon as possible.

3. Start Production

Upon pricing approval, our production team will prepare the materials and schedule production promptly. Leierwo always ensures on-time delivery.

4. Arrange Delivery

After production is completed, we will provide packaging details and arrange shipment via sea or air. We support global shipping for every order.

FAQ

Q1. Are you a trading company or a manufacturer?

We are a factory with over 20 years of experience in casting and machining. We have rich expertise in this industry. If you come across suppliers claiming to produce castings in a wide range of materials (such as steel, iron, stainless steel, copper, etc.), they are likely trading companies. If you see workshops actively producing parts, you can be assured that we are a genuine manufacturer.

Q2. Can you quote based on 3D drawings?

Yes, as long as we receive CAD files or compatible 3D models that can be viewed with software like First Quote or Firstcut browser, we can provide a quotation. Please note that 2D drawings alone are insufficient for manufacturing precision components.

We support 3D CAD models from SolidWorks (.sldprt), ProE (.prt), and other CAD systems, commonly in IGES (.igs), STEP (.stp), ACIS (.sat), or Parasolid (.sat) formats.

Q3. How do you handle RFQs (Request for Quotation)?

We have an internal service system that responds to emails within 4 hours. If your request is urgent, please specify it in your email so we can prioritize your inquiry.

Q4. What is your typical lead time?

For rapid prototyping:
Silica sol casting: 20–30 days
Sand casting: 7–10 days
For mass production with machining included, the typical lead time is 45–60 days.
More complex parts may require a different delivery schedule.

Q5. Do you provide samples? Are they free?

Yes, we provide samples based on your drawings for you to confirm structure and quality. If the sample does not meet your requirements, we will replace it free of charge until it is qualified.

Q6. What payment methods do you accept?

We accept T/T (bank transfer), Alipay, credit card, etc. Typically, we require a 30% down payment upon order confirmation and the remaining 70% before shipment. For custom parts with complex requirements, additional pricing terms may apply.

Q7. How do you ensure quality control?

We have a comprehensive quality control system that covers every step, from raw material procurement to machining processes and final inspection. For critical components, we strictly follow drawing standards and customer specifications.

All customer data is kept confidential. Only trained engineers are authorized to handle production orders. Third-party inspection or factory audits are welcome, or you may use our in-house quality team for final inspection.

Q8. Do your products come with a warranty?

Yes, we guarantee that all materials used are 100% genuine and as specified.

Q9. How do you view your relationship with customers?

We value long-term cooperation and support our customers’ production needs.

We believe every honest customer is a friend, and we treat our partnerships sincerely—building friendships and strong teams regardless of where our customers come from.