Additive Manufacturing by MMA Welding Process Characteristics and Microstructural, Mechanical Properties: Propose to Modify the Welding Procedure Specification - Crimson Publishers

Additive Manufacturing by MMA Welding Process Characteristics and Microstructural, Mechanical Properties: Propose to Modify the Welding Procedure Specification by Mir Mostafa Hosseinioun * in Crimson Publishers: Peer Reviewed Material Science Journals

 


 

 

In this investigation, high strength low alloy (HSLA) steel plates, welded by Manual Metal Arc (MMA) process. The microstructure was studied accompanied with its effect on the mechanical properties. Microstructural features in each weld run as well as inter run region of the multi run weld metal were studied and the essential cause of deteriorated weld metal toughness were explained. The micro structural studies revealed:

1. Inter granular acicular and pro-eutectoid ferrite in the as cast last run

2. Refined grains in previous runs

3. Some heterogeneous ferrite grains as well as internal defects, porosities, and precipitated micro alloying elements in the inter-layer region with previous runs.

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