研究目的
To recognize the suitable method for high temperature applications among Laser Beam Welding (LBW), Gas Tungsten Arc Welding (GTAW), and High Temperature Brazing (HTB) processes on AISI Type 316 Stainless Steel.
研究成果
LBW joints have better mechanical properties than GTAW and HTB joints. HTB joints have higher micro hardness value than LBW and GTAW joints. No observable leak was observed during HLT.
研究不足
Joints prepared using HTB process could not be tested for leak tightness due to its different shape compared to the joints prepared using LBW and GTAW processes.
1：Experimental Design and Method Selection
The study compares LBW, GTAW, and HTB processes for preparing thin wall joints for elevated temperature applications. Tests include helium leak test (HLT), micro hardness test, and tensile tests.
2：Sample Selection and Data Sources
Base material used is AISI 316 stainless steel for tubes and rods. The chemical composition of base material and filler metal is provided.
3：List of Experimental Equipment and Materials
Equipment includes Nd:YAG laser for LBW, semi-automatic machine for GTAW, and electric furnace for HTB. Materials include AISI 316 stainless steel and filler metal (BNi-7).
4：Experimental Procedures and Operational Workflow
Joints were prepared using LBW, GTAW, and HTB processes. Parameters for each process were optimized. Tests conducted include HLT, micro hardness test, and tensile tests.
5：Data Analysis Methods
Micro hardness was measured using a micro hardness tester. Tensile tests were performed using a computer-based tensile testing machine. Metallographic analysis was conducted to observe microstructures.
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Nd:YAG laser
Used for Laser Beam Welding (LBW) to prepare joints.
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semi-automatic machine
Used for Gas Tungsten Arc Welding (GTAW) to prepare joints.
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electric furnace
Used for High Temperature Brazing (HTB) to prepare joints in an argon gas environment.
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helium leak detector
Alcatel ASM 182T
Alcatel
Used to test the leak tightness of the joints prepared using LBW and GTAW processes.
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micro hardness tester
MATSUZAWA
Used to measure the micro hardness of the joint regions made by LBW, GTAW, and HTB processes.
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tensile testing machine
UTM
Used to perform tensile tests on the joints prepared using LBW, GTAW, and HTB processes.
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