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Microstructural analyses of the parent pearlitic and bainitic rail steels were performed, and the results were compared with the microstructure of the welded pearlitic and bainitic steels. An increase in the ASTM grain size number of the heat-affected zone (HAZ) for both pearlitic and bainitic slot welds was observed. The microstructural features that were identified in the weldment of both slot-welded steels were very similar. This was expected since the same welding wire was used to weld both rail steels. The weld consisted of mainly ferrite and had similar grain size. The fusion zones of the welded pearlitic and bainitic rail steels were examined after flexural tests to determine if there were any cracks present due to improper or weak fusion. Examination of the entire fusion zone under high optical magnification revealed no cracks, indicating that a perfect fusion was achieved. The three-point flexural behavior of the parent pearlitic and bainitic steels was evaluated and compared with that of the slot-welded steels. It was found that that the welded pearlitic steel has superior fracture resistance properties when compared to the parent pearlitic steel. The average fracture resistance of the parent pearlitic steel was 79 MPa√m compared to 119 MPa√m for the welded pearlitic steel. The slot-welded bainitic steel, however, showed similar fracture resistance properties to the parent bainitic steel with average values of 121 and 128 MPa√m, respectively. The failure mechanism of the welded and parent pearlitic and bainitic steels was also identified. Microvoid coalescence was observed in both welded rail steel samples. This was manifested by dimpled features, which are associated with ductile failure.

This document discusses welding symbols and their elements. It covers elementary weld symbols like square groove welds, single V groove welds, and fillet welds. Supplementary symbols for weld profiles and processes are presented. Examples show how to represent welds using arrows and lines, and how to dimension different types of welds including butt, fillet, intermittent, staggered, spot, seam, plug, and slot welds. Tail elements provide information on welding processes, acceptance levels, positions, and filler materials. - Download as a PPTX, PDF or view online for free

Plug and slot welds joint overlapping pieces of metal. You can see this symbol on either side of the reference line but not on both sides.

They are made from round holes by cutting them longer in one direction. * These holes are used for connecting steel beams with bolts or welds.

Other types of welds include flange welds, plug welds, slot welds, seam welds, surfacing welds, and backing welds.

Instead, the width of the slot is used to indicate the size of the weld, which is displayed to the left of the symbol, as is the case with plug welds.

The number closer to the groove weld symbol (R) represents the size of the root or depth of metal filling for plug and slot welds.

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Single J Groove Weld. Backing Weld. ELEMENTARY WELD SYMBOLS. Fillet Weld. Plug / Slot Weld ... Peripheral Welds. SUPPLEMENTARY SYMBOLS. Tail Optional). Sequence ...

Overview of plug and slot welds, their uses, symbology and application.

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For slot welds, find the width of each slot to the left of the symbol. You'll see the length and pitch (separated by a dash) to the right of the symbol, with a detail drawing in the tail.

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This video goes over where on a welding symbol the number of spot welds is listed. Thanks for watching & subscribing to TVWeld!

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