China Welding Manufacturers, Suppliers and Factory - Customized Welding

Your Leading Welding Services Supplier

Established in Shanghai in 2014 by industry veteran Johnny Zhao, SQM has become a trusted leader in global procurement for casting and forging. With roots in the foundry industry dating back to 2003, Johnny Zhao built SQM to provide innovative, reliable solutions for industrial manufacturers worldwide. At SQM, we implement a comprehensive quality assurance process to ensure our products meet the specific requirements of our customers. Our welding services include trailer welding, agriculture welding, construction welding, and welding to casting.

Welding To Casting
Transforming welded assemblies into cast components requires expertise in both design and manufacturing. At SQM, we share our expertise collaborating with our clients to develop high-quality cast
Construction Welding
In construction, every welded component plays a critical role in safety and stability. SQM produces custom structural elements with superior strength, meeting industry standards for demanding job
Agriculture Welding
Farming equipment requires more than just durability, it needs precision-engineered parts built for efficiency. We fabricate high-quality metal components tailored for agricultural machinery,
Trailer Welding
SQM delivers high-performance, custom-welded trailer components designed for strength and longevity. From structural frames to precision-crafted hitches, our expertise ensures durable, load-bearing

Why Choose Us?

Professional Team

SQM's engineering and quality control team, consisting of 45 professionals, ensures consistent quality delivery across all projects.

Quality Assurance

SQM strictly complies with internationally recognized quality standards and holds key certifications, including ISO 9001 and TS16949.

Advanced Equipment

Our laboratory is equipped with a wide range of advanced testing equipment, such as spectrometers for chemical analysis, tensile testing machines for mechanical analysis, hardness testers, Charpy impact testing systems, as well as X-ray and magnetic particle inspection (MPI) devices.

Production Market

SQM collaborates with 42 trusted suppliers across China and provides services to more than 130 global industrial equipment manufacturers in Europe and North America.

Types of Welding Services

Welding To Casting
Transforming welded assemblies into cast components requires a deep understanding of both fabrication and foundry processes. At SQM, we support our clients in re-engineering multi-part welded structures into single-piece castings, helping to reduce manufacturing complexity, improve mechanical performance, and lower production costs.

Construction Welding
In the construction sector, welded components must meet strict structural and safety requirements. At SQM, we fabricate custom metal parts for construction equipment and infrastructure applications using certified welding procedures and high-strength materials.

Agriculture Welding
Farming equipment requires more than just durability, it needs precision-engineered parts built for efficiency. We fabricate high-quality metal components tailored for agricultural machinery, ensuring reliability in the field and optimized performance for heavy-duty operations.

Trailer Welding
SQM delivers high-performance, custom-welded trailer components designed for strength and longevity. From structural frames to precision-crafted hitches, our expertise ensures durable, load-bearing parts that meet the toughest demands on the road.

Parameters of Welding Services

Name	Custom stainless steel fabricators metal tube bend frame parts precision metal cnc tube bending rolling welding service.
Optional Material	1) AL1060, AL6061, AL6061, AL5052.
	2) Steel, mild steel, SPCC.
	3) SS201, SS303, SS304, SS316, SS316L.
	4) Galvanized sheet
Thickness	0.8mm, 1.0mm, 1.5mm, 2.0mm and any thickness.
Size	According to the drawings,samples or your requests.
Drawing Format	3D/CAD/Dwg/IGS/STP
Additional	Sample Order and Small Order are acceptable
Accuracy	Accuracy Of Machining: +/-0.01 mmAccuracy of Grinding: +/-0.005 mm
	Surface Roughness: Ra0.8
	Parallelism: +/-0.005mm
	Verticality:+/-0.005mm
	Concentricity: 0.003mm
Design Measurement	Accept customization,various painting colors,shapes,sizes available.You'd better give us the design drawing. Of course if not we.
Design Measurement	Can provide professional design service.
More Custom	Surface printing design
	Industrial appearance design
	Structure design
	Whole system design

Customization Options

Material: Customizable.

Shape: Customizable.

Size: Customizable.

Different Types of Welding Processes

Gas Metal Arc Welding (GMAW)
Gas metal arc welding, also known as metal inert gas (MIG) welding, is a semiautomatic welding process. In this process, a power supply and consumable wire electrode create an electric arc between the consumable wire electrode and the workpiece metals. The workpiece melts and fuses under the heat produced by the electric arc.

Gas Tungsten Arc Welding (GTAW)
Gas tungsten arc welding or tungsten inert gas (TIG) welding involves generating an electric current between a tungsten electrode and the metal being joined. A shielding gas is used around the weld to protect it from the surrounding environment. This welding process is used in aerospace industries or to weld thin workpieces of non-ferrous metals.

Flux-Cored Arc Welding (FCAW)
Flux-cored arc welding uses a continuously consumable tubular electrode filled with flux. This semi-automatic or automatic arc welding method is ideal for large-scale industrial applications where high-speed welding is essential. FCAW is ideal for mild steel, high nickel alloys and stainless steel.

Submerged Arc Welding (SAW)
Submerged arc welding is a fully mechanized technique in which an electric arc forms between a continuously supplied bare wire electrode and the material being welded. The arc and molten metal are submerged under a layer of granular flux, which also protects the weld from contamination. This method is commonly used for welding thicker sections of stainless steel, alloy steels and carbon-manganese steel.

Things to Note When Welding

Using too much filler rod. If you're using too much filler material, it can cause porosity or cratering in your finished product which will require more grinding and polishing time in post-processing stages.

Overheating base metal or filler material during welding because it may burn through wire feeder cables or gas hoses.

Trying to weld too fast (you will create weak joints).

Failing to keep the torch tight against the metal surface (this will create a rough seam).

Ignoring the shielding gas pressure setting or flow rate (too much gas may cause damage).

Certificates

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Package & Delivery

Package	Tissue paper, EPE, standard carton or plastic tray, sponge tray, cardboard tray, etc., can be customized according to customer requirements.
Delivery	DHL, FedEx, EMS, UPS, or customer's requirements.

FAQ

Q: What improvements have been made to SQM's welding processes?

A: We apply design-for-casting principles, optimize wall thicknesses, add appropriate draft angles, and run simulation analysis to validate the casting process before tooling. This conversion not only improves structural integrity and repeatability but also shortens production time and reduces reliance on skilled welding labor. The result is a streamlined, more cost-effective component with consistent quality, suitable for medium to large-scale manufacturing.

Q: Are there any shape requirements for welding performed by SQM?

A: We apply MIG, TIG, and robotic welding depending on the material and geometry, ensuring strong, consistent joints with controlled distortion. Fixtures and inspection protocols guarantee dimensional accuracy across batches, and welds are tested visually and, when needed, by non-destructive methods.

Q: How about your delivery time?

A: Generally speaking, it takes about 7-10 working days after we receive your confirmed order and payment. Specific delivery time depends on the number of your orders, please contact with us.

Q: Does SQM guarantee welding and fabrication?

A: All welding and fabrication work is carried out under ISO 9001 and ISO 45001 quality and safety standards, ensuring that every part we deliver is ready for demanding job site conditions.

Q: How does SQM ensure product quality?

A: Our dedicated QC team collaborates with our supply factories to ensure every product meets the highest standards.

We're well-known as one of the leading welding manufacturers and suppliers in China. Please feel free to buy high quality welding from our factory. For customized service, contact us now.

Agriculture Welding, Trailer Welding, welding