MIG Welding Service for Custom Metal Fabrication

Product & Service Introduction

MIG Welding from Hehua Machinery Technology (Kunshan) Co., Ltd. is a professional custom metal welding service for industrial machinery, equipment frames, structural components and precision fabricated assemblies. The service covers MIG/MAG, CO₂ welding, TIG welding, spot welding, robotic welding and other complementary processes to accommodate different material, thickness, strength and appearance requirements.

Based on drawings, samples or supplied raw materials, Hehua Machinery Technology (Kunshan) Co., Ltd. provides an integrated OEM/ODM workflow covering material preparation, fixture fabrication, welding, straightening, CNC secondary machining and surface finishing. This approach helps customers reduce supplier coordination and maintain consistent quality throughout the manufacturing process.

The service is suitable for carbon steel, galvanized steel, stainless steel, aluminum alloy, cast iron, ductile iron and copper alloy components. Dissimilar metal welding can also be evaluated according to the specific application and joint requirements.

Key Advantages

1. Professional MIG/MAG Welding

MIG/MAG and CO₂ welding processes are available for a wide range of structural and fabricated metal components. Welding parameters are selected according to material, plate thickness, joint structure and required mechanical performance.

2. Multiple Welding Processes

In addition to MIG welding, available processes include TIG/GTAW argon welding, spot welding, fillet welding, submerged arc welding and brazing. Robotic automatic welding is available for standardized high-volume production.

3. Wide Material Compatibility

Weldable materials include carbon steel, galvanized steel, 304/316 stainless steel, aluminum alloy, cast iron, ductile iron and copper alloy. Material test certificates and material traceability can be provided when required.

4. Precision Welding & Straightening

After welding, assemblies can undergo straightening, deburring and dimensional inspection. Typical overall dimensional tolerance is ±0.1–±0.3 mm, while flatness can reach ≤0.03 mm/100 mm after straightening, depending on part structure and process conditions.

5. Pressure-Part Testing

For pressure-related welded assemblies, air-tightness, water-tightness and other inspection methods are available. NDT options include magnetic particle testing (MT) and ultrasonic testing (UT) for critical applications.

6. Robotic Welding for Batch Production

Manual welding stations and robotic welding cells support both prototype and mass production. Automated welding is particularly suitable for repeatable structural components requiring consistent weld quality and production efficiency.

7. Complete Post-Weld Treatment

Post-weld processing can include grinding, straightening, shot blasting, black oxide, electrophoresis, Dacromet, powder coating, galvanization, anodizing and polishing.

OEM & ODM Welding Service

Hehua Machinery Technology (Kunshan) Co., Ltd. supports custom production based on:

• 2D CAD drawings

• 3D STEP files

• IGS files

• SolidWorks files

• UG files

• Physical samples

• Customer-supplied raw materials

The one-stop workflow can include blanking, welding fixture fabrication, MIG/TIG/spot welding, straightening, CNC secondary machining and surface finishing.

For new projects, engineers can review drawings and assess welding deformation, cracking risks and manufacturability before production. Welding DFM optimization can help improve structural design, reduce deformation and minimize rejection during mass production.

Welding Processes

Typical Applications

Industrial Machinery
Equipment frames, machine bases, brackets, housings and structural assemblies.

Compressor Equipment
Compressor frames, pressure housings and sealed welded components.

Construction Machinery
Heavy-duty brackets, load-bearing structures and equipment components.

Rail Transit
Metal structural parts and welded assemblies manufactured according to applicable welding requirements.

Automotive Manufacturing
Custom welded frames, brackets, housings and structural components.

New Energy Equipment
Welded structures and metal components for specialized energy equipment.

Semiconductor Equipment
Precision equipment frames, racks and structural components for semiconductor-related machinery.

Outdoor Equipment
Corrosion-resistant frames, enclosures and structural assemblies requiring protective surface treatment.

Quality Control

Hehua Machinery Technology (Kunshan) Co., Ltd. operates an ISO 9001-certified quality management system and provides inspection throughout the manufacturing process.

Quality control can include:

• Incoming raw material inspection

• Material certification and traceability

• Welding process inspection

• First article dimensional inspection

• Periodic batch inspection

• Post-weld straightening inspection

• Weld appearance inspection

• Air-tightness testing

• Water-tightness testing

• MT magnetic particle testing

• UT ultrasonic testing

• Final inspection reports

Welds are controlled to minimize common defects such as porosity, slag inclusion and cracks. Critical pressure components can receive additional NDT and sealing inspections according to project requirements.

Production & Delivery

The production system combines manual welding stations with automatic robotic welding cells and supporting cutting, straightening and polishing capabilities. Monthly production capacity can reach 30,000 sets, supporting prototype development, small-batch orders and long-term mass production.

Typical standard-order delivery is 12–25 days, depending on product complexity, order quantity and required processes. Rush orders can be prioritized according to production capacity, while export orders can be supported with the necessary customs and shipping documentation.

Surface Finishing Options

After welding and dimensional correction, customers can select suitable surface treatments according to the operating environment and appearance requirements:

• Grinding and polishing

• Shot blasting

• Black oxide

• Electrophoresis

• Dacromet

• Powder coating

• Galvanization

• Anodizing

Salt spray testing and related surface treatment reports can be provided when required for corrosion-resistant applications.

Technical Support

Custom welding fixture design, process optimization and production troubleshooting are available throughout the project. Engineers can support welding process development, deformation control, defect correction and production optimization.

For overseas customers, remote technical support is available for assembly and process-matching requirements. Continuous process improvement can also be implemented for long-term production programs.

Company Profile

Hehua Machinery Technology (Kunshan) Co., Ltd. is a subsidiary established in 2018 by Shanghai Hehua Machinery Technology Co., Ltd., which was founded in 2005. The company specializes in key metal parts and components for automotive, rail transit, aerospace, wind power, nuclear power, industrial machinery, semiconductor equipment and new energy equipment.

The company operates a production facility covering more than 17,800 square meters and has over 160 employees. Its manufacturing capabilities support customized metal fabrication and integrated welding production for high-end equipment applications.

Hehua has obtained ISO 9001, IATF 16949, and EN 15085 certifications. Its welders have also passed EN ISO 9606-1 qualification certification, supporting professional welding production for demanding industrial applications.

FAQ

Q1: What materials can be welded?
MIG welding services are available for carbon steel, galvanized steel, stainless steel, aluminum alloy, cast iron, ductile iron and copper alloy. Dissimilar metal welding can be evaluated for specific projects.

Q2: Can you manufacture according to drawings or samples?
Yes. OEM and ODM production can be based on 2D drawings, 3D CAD files, physical samples or customer-supplied materials.

Q3: Do you provide robotic welding?
Yes. Robotic automatic welding cells are available for repeatable components and mass-production orders requiring consistent welding quality.

Q4: Can welded parts receive surface treatment?
Yes. Grinding, shot blasting, powder coating, galvanization, anodizing, electrophoresis, Dacromet, black oxide and polishing are available according to application requirements.

Q5: Can you inspect pressure welded assemblies?
Yes. Air-tightness, water-tightness and NDT inspections such as MT and UT can be arranged for critical pressure-related welded components.

Q6: What is the typical delivery time?
Standard orders generally require approximately 12–25 days, depending on specifications, quantity and production processes. Sampling and urgent orders can be discussed separately.

For custom MIG welding, robotic welding and complete OEM/ODM metal fabrication, contact [Hehua Machinery Technology (Kunshan) Co., Ltd.] to discuss drawings, materials, quantities and technical requirements.