slot welds - mobile-navi.org

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

The difference between plug and slot welds is that the plug weld’s shape is characterized by its diameter, whereas the slot weld’s shape is characterized by both diameter and length.

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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.

Strength solution of welds: Two types of damage appear in plug and slot welds: 1) shear in the weld base surface 2) tear in the weld circumferential surface.

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Plug and slot welds are permitted for the transfer of shear force only. As such, they are sometimes used to transmit shear in lap joints, to join components of built-up members, or to prevent buckling of lapped parts.

Plug and slot welds involve filling a hole or slot with weld metal, rather than creating a slot for the weld. Therefore, the width of the slot is not relevant for plug and slot welds.

Basic Symbols 
 Basic welding symbology divides the welds into: 
 Groove welds. 
 "Fillet" welds. 
 Plug welds. 
 Slot welds.

The size of resistance spot welds is designated as the diameter of the weld expressed in fractions or in decimals in hundredths of an inch and must be shown, with or without inch marks, to the left of the weld symbol (fig.

Weld symbols are used to indicate the welding processes used in metal joining operations, whether the weld is localized or “all around”, whether it is a shop or field weld, and the contour of welds.

Even though they differ in appearance, the weld symbol that represents plug and slot welds is a rectangle. Due to the nature of these processes, this symbol cannot be represented as weld on both sides.

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