AR200 steel, a type of abrasion-resistant steel, offers excellent hardness and toughness, making it suitable for various applications where resistance to wear and impact is essential. However, welding AR200 steel requires careful consideration of specific procedures to ensure high-quality welds and maintain the material’s desired properties.
In this blog post, we will explore the welding procedure for AR200 steel, including important guidelines and best practices.
Understanding AR200 Steel
AR200 steel is a quenched and tempered alloy with a nominal hardness of approximately 200 Brinell. It possesses excellent abrasion resistance and impact strength, making it commonly used in applications such as mining equipment, construction machinery, and agricultural implements.
AR200 steel is available in various forms, including mill plate, temper leveled plate, and coils, providing flexibility in its usage. However, it’s important to note that AR200 steel is not suitable for structural applications and should be used primarily for wear-related purposes.
AR200 Steel Chemical Composition
Based on ladle analysis, the maximum weight percentage (wt %) for the chemical composition of AR200 steel is as follows:
- Carbon (C): 0.40% maximum
- Manganese (Mn): 1.50% maximum
- Phosphorus (P): 0.025% maximum
- Sulfur (S): 0.010% maximum
- Silicon (Si): 0.35% maximum
These values represent the maximum allowable concentrations of each element in AR200 steel, as determined by ladle analysis.
AR200 Steel Mechanical Properties
AR200 steel possesses certain mechanical properties, with a nominal hardness of 200 HBW (Brinell Hardness). It is important to note that AR200 steel is produced to meet a specified chemical composition only. If specific mechanical properties are required for a particular application, it is recommended to make inquiries accordingly.
|200 ksi (1380 MPa)
|140 ksi (965 MPa)
|40 ft-lb (54 J)
|Modulus of Elasticity
|30 x 106 psi (207 GPa)
|0.283 lb/in3 (7.85 g/cm3)
Can AR steel be welded?
As explained in this article, AR (Abrasion Resistant) steel can indeed be welded using conventional welding processes. However, it is crucial to follow certain recommendations to ensure successful welds and maintain the desired properties of the steel.
Preheating the AR steel before welding is often recommended to minimize the risk of cracking, with the specific preheating temperature depending on factors such as the thickness of the steel and the welding procedure used.
Additionally, using low hydrogen welding consumables and employing proper welding techniques, such as controlling heat input and avoiding rapid cooling, can help mitigate the potential for cracking.
Welding Procedure Guidelines
AR200 steel plate is a type of carbon-manganese steel that is designed for applications where moderate wear resistance is required. It has a nominal hardness of 200 Brinell (HBW), which indicates its ability to withstand indentation and abrasion.
Welding AR200 steel requires attention to factors such as heat input, hydrogen control, and preheating to minimize the risk of cracking and preserve the material’s properties.
Select Appropriate Consumables
Choosing the right welding consumables is crucial for successful AR200 welding. Low hydrogen electrodes, such as E10018 or E9018, are commonly recommended for welding AR200 steel. These electrodes have low hydrogen content, reducing the risk of hydrogen-induced cracking. Consult the welding consumable manufacturer’s recommendations for specific electrode selection.
|MINIMUM PREHEAT AND INTERPASS TEMPERATURE (°F)
|AWS E10018 or E9018
|AWS ER90S-X with %V < 0.05%
|AWS ER90S-X with %V < 0.05%
|Flux Cored Arc (FCAW)
|AWS E9XT X
When it is not necessary to match consumables, it is advisable to use lower strength electrodes. To minimize the risk of cold cracking, it is recommended to allow for slow cooling after welding and consider a post-weld heat treatment at 1100°F (595°C).
For SMAW, it is important to store and dry the electrodes properly. Similarly, when performing SAW welding, the welding flux should be thoroughly dried to ensure it is free from moisture. These precautions help maintain the integrity and quality of the welding process.
Preheating and Interpass Temperature Control
Preheating the AR200 steel before welding is essential to minimize cooling rates and reduce the risk of cracking. The preheating temperature typically ranges between 200°F and 400°F (93°C and 204°C). Maintaining the recommended interpass temperature during multi-pass welding is also critical to prevent excessive cooling rates and maintain proper heat input.
Proper Joint Preparation
Ensure that the joint edges are clean and free from contaminants such as oil, grease, and rust. Use appropriate cleaning methods like grinding or wire brushing to ensure good weld quality. Beveling the joint edges can enhance the weld penetration and provide better fusion.
Employ proper welding techniques to achieve sound and defect-free welds. Maintain a consistent arc length and travel speed throughout the welding process. Use stringer bead technique for flat and horizontal welds and weave technique for vertical and overhead welds. Avoid excessive heat input, as it can lead to softening of the material.
Post-Weld Heat Treatment (PWHT)
In some cases, post-weld heat treatment may be required to relieve residual stresses and improve the material’s properties. Consult the specific project requirements or industry standards to determine if PWHT is necessary for your AR200 steel weldments.