WSD707_Wansen Welding Materials (Jiangsu) Co., Ltd.

1. Surfacing is a welding process that deposits a layer of metal with wear-resistant, corrosion-resistant, heat-resistant and other properties on the surface or edge of a workpiece. It can repair and improve the service life of parts, reasonably use materials, improve product performance, and has significant economic benefits in cost reduction. The working conditions of surfacing are very complex, and it is necessary to select appropriate electrodes according to different requirements. Different workpieces and surfacing electrodes require different surfacing processes to achieve satisfactory surfacing results.

2. The most common problem in surfacing is cracking. The main methods to prevent cracking are:
① Preheating before welding, controlling interlayer temperature, and slow cooling after welding.
② Post-weld stress-relief heat treatment.
③ Using low-hydrogen surfacing electrodes to avoid cracking in multi-layer surfacing.
④ When necessary, depositing a transition layer between the surfacing layer and the base metal (using electrodes with low carbon equivalent and high toughness).

Cracking is directly related to the carbon content of the workpiece and the deposited metal in the weld, as well as alloying elements. Therefore, the preheating temperature is generally estimated based on the carbon equivalent of the electrode used. The carbon equivalent formula is as follows:

3. This estimation formula is suitable for low-carbon steel, medium-carbon steel, high-carbon steel and low-alloy steel materials.

Carbon equivalent(%)	Preheat Temperature	Carbon equivalent(%)	Preheat Temperature
≤0.40	100℃ the above	≤0.70	250℃ the above
≤0.50	150℃ the above	≤0.80	300℃ the above
≤0.60	200℃ the above	≤0.90	350℃ the above

For high-manganese steel and austenitic stainless steel, preheating may not be required. The preheating temperature for high-alloy steel should be greater than 400°C.

The surfacing effect, including the hardness, wear resistance, and heat resistance of the weld layer, is related to the following factors:
① The magnitude of welding current and the length of the arc. A large current and long arc easily cause burning loss of alloying elements; conversely, a small current and short arc are beneficial for the transition of alloying elements.
② Preheating temperature and slow cooling conditions determine the quality of the surfacing layer.
③ Different heat treatment methods for certain surfacing metals can result in different hardness levels.

Our Capabilities

Wansen Welding Materials (Jiangsu) Co., Ltd. is an integrated welding professional company specializing in R&D, production, and operation. Founded in 1992, after more than 30 years of development, the "Wansen" brand welding materials have a series of welding materials that meet customer needs. The main products include non-alloy steel and fine-grained steel electrodes, high-strength steel electrodes, heat-resistant steel electrodes, stainless steel electrodes, surfacing electrodes, cast iron electrodes, nickel and nickel alloy electrodes for shielded metal arc welding; stainless steel, hardfacing surfacing, heat-resistant steel, and nickel-based series solid and flux-cored wires suitable for gas shielded welding.

Our Qualifications

The company adheres to the business philosophy of unity, pragmatism, innovation, service, and win-win. It has strengthened R&D efforts, adjusted product structure, continuously innovated, and strictly controlled quality. It has successively passed the ISO9001 quality management system certification and CE certification. The company implements a market strategy of integrating marketing and service, and has established a complete professional sales and service network. With the purpose of honest operation and continuous improvement of customer satisfaction, it makes unremitting efforts to achieve win-win results with customers.

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