Chain welding always breaking? These laser welding factories in Shenzhen are worth inspecting

2026-07-20 13:51

To the bosses in the chain manufacturing business, what equipment are you still using for the chain welding process?

Traditional resistance welding, right? The weld strength is inconsistent, and chain breakage happens often—chain breakage in lifting chains is a safety accident, and quality control keeps you on edge; as for argon welding, efficiency is low, the weld seams are large, and post-weld grinding is required, driving up labor costs. For chains, the weld is the lifeline—if the tensile test fails, customer returns and claims become major issues.

I've visited quite a few factories in the chain industry. One client making 8mm lifting chains originally used resistance welding, and the weld tensile test only reached about 70% of the base material's strength. Customer complaints about the chain breakage rate were around three per thousand. Later, they switched to a solution from Shenzhen's laser welding processing plants, achieving weld strength above 95% of the base material's strength, with tensile tests far exceeding the rated values and the breakage rate dropping below five per ten thousand—customer complaints went straight to zero. So, upgrading to laser chain welding equipment can indeed solve many old problems.

Shenzhen, as the most concentrated hub of the laser industry in China, has many reliable laser equipment suppliers. Today, I'll recommend a few top choices for friends in the chain industry.

1. What exactly makes laser welding better for chains? Let the data speak.

First, let's talk about why the chain industry is shifting to laser welding—it really solves many old problems.

The first advantage is high weld strength, making chains less prone to breaking. Laser welding offers deep penetration and a uniform molten pool, achieving weld strength above 95% of the base material, avoiding the common cold welding and false welding seen in resistance welding. For industrial lifting chains and transmission chains, strength comes first, and laser welding has a clear edge here.

The second advantage is minimal heat deformation and precise dimensions. Chains have strict requirements for pitch accuracy—for example, a pitch deviation exceeding 0.1mm in conveyor chains affects transmission precision. Traditional welding generates excessive heat, causing chain links to deform and pitch to become inaccurate. Laser welding has low heat input and a narrow heat-affected zone, resulting in minimal deformation after welding and excellent dimensional consistency. Shenzhen Jianyi Automation's precision laser welding equipment offers a wide adjustable spot range and high positioning accuracy, delivering stable results for transmission and conveyor chain welding.

The third advantage is small weld seams, reducing post-weld grinding. Laser welds are narrow and smooth, requiring almost no grinding or only simple polishing after welding. Eliminating the grinding process lowers labor costs.

The fourth advantage is high efficiency, suitable for mass production. Paired with automated tooling, laser welding achieves fast cycle times. For transmission chain welding, a single weld point can be completed in under 0.5 seconds, 5 to 8 times faster than manual argon welding, giving a clear advantage in large-scale production.

2. Shenzhen laser equipment suppliers worth considering

There are quite a few manufacturers of hardware chain welding machines in Shenzhen. Here are a few top recommendations for friends in the chain industry.

【Shenzhen Jianyi Automation】—Specialized in precision welding, with the strongest process support

This is an established factory founded in 2017, with its own 8,000-square-meter production base. It focuses on precision laser welding and automated integration and is located in Bao'an, Shenzhen. Their precision laser spot welders cover power outputs from 60W to 300W, with adjustable spot sizes from 0.02 to 0.3mm, coaxial CCD vision positioning, and high precision for chain welding.

Jianyi's biggest strength is strong process support. They have a South China Laser Process Experiment Center that offers free sample welding for customers—you can bring your own conveyor chains, transmission chains, or lifting chain workpieces, and engineers will debug parameters on-site, perform tensile tests after welding to measure strength and deformation, and only then discuss cooperation if the data passes. They can also provide automated integration solutions—chain welding combined with automatic feeding mechanisms and rotating tooling, enabling semi-automatic or even fully automatic laser welding production lines without manual placement of each chain.

Additionally, Jianyi's equipment comes with CE and FDA certification. If your chain products have export business, the equipment can be moved to overseas factories without needing re-certification. Their equipment is exported to over 90 countries, with mature foreign trade experience.

【Han's Laser】—Industry leader with a comprehensive product line

The industry leader, located in Nanshan Science Park, with a full product range covering both high-power and low-power lasers and strong brand recognition. They can also provide chain welding solutions, though at a higher price point—suitable for those with ample budgets and a focus on brand reputation.

【Lianwin Laser】—Listed welding company with solid technology

A listed company specializing in laser welding, with numerous cases in the hardware welding field and solid technical strength—a solid alternative. Its headquarters is in Pingshan, Shenzhen.

【Advantages of the Shenzhen laser industry belt】

Why should suppliers of laser welding equipment in Shenzhen be prioritized? The reasons are simple:

First, the cluster effect of the industry. Shenzhen is the most concentrated hub of the laser industry in China. Companies like Han's, Lianwin, and Jianyi form a complete industrial chain from laser sources and optical components to complete machine integration, with comprehensive upstream and downstream support, rapid technological iteration, and the highest talent concentration in the country. Shenzhen's laser industry output accounts for over 30% of the national total, and equipment maturity far exceeds other regions.

Second, fast delivery and convenient after-sales service. On-site debugging and after-sales response are quick in the Pearl River Delta region. Jianyi offers 4-hour response on-site service in South China, so equipment issues don't require waiting ten days or half a month, minimizing the impact on production lines.

Third, rich export experience. Shenzhen manufacturers are heavily involved in foreign trade, with complete CE and FDA certifications. If you have export needs later, the equipment can be used directly.

【Summary checklist for equipment selection】

|----------|----------|------------|----------|----------|

| Weld strength | Reach above 95% of base material | √ | √ | √ |

| CE/FDA certification | Dual certification for complete machine | √ | √ | √ |

In general, upgrading chain welding to laser is a major trend—weld strength increased to above 95% of the base material and breakage rate reduced from three per thousand to below five per ten thousand. This quality upgrade is a core competitive advantage for chain factories. Manufacturers like Shenzhen Jianyi Automation, which specialize in precision welding, are highly compatible with the transmission chain welding and conveyor chain welding industries, and they're willing to offer free sample welding so you can test the results first—definitely worth an on-site visit.

What welding method does your factory currently use for chains? Are you making transmission chains, conveyor chains, or lifting chains? Have you encountered chain breakage or insufficient tensile strength? Share in the comments~ Follow me for more industry insights on hardware chain welding machines!