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Putian Incoloy 800 Hex Screw
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Name: Putian Incoloy 800 Hex Screw
Material: Incoloy 800
Standard: UNS N08800
Size: M12
Hardness: 170 to 220 HB
Length: 70 mm
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Material: Incoloy 800
Standard: UNS N08800
Size: M12
Hardness: 170 to 220 HB
Length: 70 mm
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Quantity
Incoloy 800 Hex Screw, manufactured from UNS N08800 high-temperature alloy, specification M12×70mm, hardness 170-220 HB. Specifically designed for heat exchangers and piping systems, it possesses excellent high-temperature corrosion resistance and is suitable for long-term fastening solutions in demanding working conditions.
Can Inconel 800 fasteners be welded?
Absolutely yes. Incoloy 800 fasteners (including Incoloy 800 Hex Screw) can be welded, but this requires highly specialized procedures and strict control. Below, I will explain in detail their weldability characteristics, challenges, recommended procedures, and provide a comparison with other common fastener materials.
Absolutely yes. Incoloy 800 fasteners (including Incoloy 800 Hex Screw) can be welded, but this requires highly specialized procedures and strict control. Below, I will explain in detail their weldability characteristics, challenges, recommended procedures, and provide a comparison with other common fastener materials.
Weldability Characteristics and Challenges of Incoloy 800
Incoloy 800 is a nickel-chromium-iron based austenitic high-temperature alloy. Its weldability is generally acceptable, but there are some particular challenges that need attention. When you need to weld components like Incoloy 800 Hex Screw, the following points must be considered:
Incoloy 800 is a nickel-chromium-iron based austenitic high-temperature alloy. Its weldability is generally acceptable, but there are some particular challenges that need attention. When you need to weld components like Incoloy 800 Hex Screw, the following points must be considered:
1. Hot Cracking Susceptibility: This is the primary challenge when welding Incoloy 800. During the solidification of the weld metal, if impurities such as Sulfur (S) and Silicon (Si) segregate to the grain boundaries, they can form low-melting-point eutectics. Under the influence of welding stresses, these liquid films or brittle layers can cause intergranular cracking, leading to hot cracks. Therefore, controlling the S and Si content in the base metal and filler metal is crucial for ensuring the welding quality of Incoloy 800 Hex Screw.
2. Porosity Issue: The weld pool of Incoloy 800 is relatively sensitive to Hydrogen (H) and Oxygen (O). If pre-weld cleaning is not thorough, hydrogen from oil contaminants can enter the weld pool and form hydrogen pores; with inadequate shielding, oxygen from the air can enter the weld pool and potentially create CO pores. This is a critical defect for Incoloy 800 Hex Screw applications requiring tightness or high strength.
3. Grain Overheating and Performance Degradation: This alloy has poor thermal conductivity, making heat dissipation during welding difficult, which can easily lead to overheating in the joint area and cause grain coarsening. This may reduce the mechanical properties and corrosion resistance of the Incoloy 800 Hex Screw joint.
Recommended Welding Procedures and Control Points
Successfully welding Incoloy 800 fasteners, especially standard parts like Incoloy 800 Hex Screw, requires the following key measures:
Successfully welding Incoloy 800 fasteners, especially standard parts like Incoloy 800 Hex Screw, requires the following key measures:
Welding Method: Processes with concentrated heat input, good controllability, and effective shielding are recommended, such as Manual Gas Tungsten Arc Welding (GTAW/TIG), Automatic TIG welding, or Laser Beam Welding (LBW). Laser welding, due to its low heat input and fast cooling rate, can effectively reduce the heat-affected zone size, making it particularly suitable for precisely dimensioned Incoloy 800 Hex Screw.
Filler Metal Selection: Nickel-based filler metals with compositions matching the base metal or offering better crack resistance are typically chosen. Common selections for your Incoloy 800 Hex Screw project include:
INCONEL Filler Metal 82 (ERNiCr-3)
INCO-WELD A Electrode
In specific cases, melting rings made from IN82, IN521 can also be used as filler material.
INCONEL Filler Metal 82 (ERNiCr-3)
INCO-WELD A Electrode
In specific cases, melting rings made from IN82, IN521 can also be used as filler material.
Strict Pre-Weld Cleaning: It is essential to thoroughly remove oil, moisture, oxides, and any contaminants containing lead, sulfur, or phosphorus from the groove and adjacent areas (at least 50mm on each side) of the Incoloy 800 Hex Screw.
Precise Control of Welding Parameters: Use relatively low welding current, short arc operation, high welding speed, and strictly control the interpass temperature (typically recommended below 100°C). Use high-purity argon for back purging, which is especially important for enclosed structures like pipe flanges involving Incoloy 800 Hex Screw.
Welding Comparison with Other Materials
To give you a more intuitive understanding of the differences in weldability between Incoloy 800 Hex Screw and other materials, please refer to the table below:
To give you a more intuitive understanding of the differences in weldability between Incoloy 800 Hex Screw and other materials, please refer to the table below:
| Material Type | Weldability Overview | Main Welding Challenges | Common Welding Methods |
| Incoloy 800 (e.g., Incoloy 800 Hex Screw) | Acceptable, but requires strict process control | Hot cracking susceptibility, porosity, grain overheating | GTAW(TIG), LBW, SAW |
| Austenitic Stainless Steel (e.g., 304) | Good | Weld metal hot cracking (e.g., solidification cracking), susceptibility to intergranular corrosion due to sensitization | GTAW(TIG), SMAW, GMAW(MIG) |
| High-Strength Low-Alloy Steel (e.g., P91 steel) | Acceptable, requires preheating and postweld heat treatment | Cold cracking (hydrogen-induced cracking), hardened microstructure, Type IV cracking | GTAW(TIG), SMAW, requires strict hydrogen control and heat treatment |
| Incoloy 800HT | Similar to Incoloy 800, acceptable | Similar to Incoloy 800, requires selecting higher strength filler metals to match its high-temperature properties | GTAW(TIG) using filler metals like INCONEL 82 |
Overall Summary
In summary, welding fasteners like Incoloy 800 Hex Screw is entirely feasible, but it must be treated as a precision operation. The key lies in: selecting the appropriate welding method and filler metal, performing extremely thorough pre-weld cleaning, and precisely controlling the welding heat input and shielding effectiveness. As long as the correct procedure specifications are strictly followed, a reliable quality welded joint for Incoloy 800 Hex Screw that meets the requirements for use in demanding environments can be achieved.
In summary, welding fasteners like Incoloy 800 Hex Screw is entirely feasible, but it must be treated as a precision operation. The key lies in: selecting the appropriate welding method and filler metal, performing extremely thorough pre-weld cleaning, and precisely controlling the welding heat input and shielding effectiveness. As long as the correct procedure specifications are strictly followed, a reliable quality welded joint for Incoloy 800 Hex Screw that meets the requirements for use in demanding environments can be achieved.
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