What is plug weld and slot weld?

Plug welds and slot welds are used to join overlapping members, one of which has holes (round for plug welds, elongated for slot welds) in it. Weld metal is deposited in the holes and penetrates and fuses with the base metal of the two members to form the joint.

What is plug welding?

A weld made in a circular hole in one member of a joint fusing that member to another member. A fillet-welded hole is not to be construed as conforming to this definition.

What is the difference between a spot weld and a plug weld?

A true spot weld is when two panels are pinched together and joined through an electrical current to fuse them together. A rosette or plug weld is when you drill a hole in the top layer, pinch the two panels together, and fill the hole; joining the two panels together.

What is slot weld used for?

Slot welds are used to transmit shear in lap joints and to prevent buckling of lapped parts. In buildings, they also may be used to join components of built-up members.

What are the plug and slot welding symbols?

8 Plug Weld symbols. Plug welds are a round weld that is made inside of an existing hole most commonly in one piece of metal, welding that piece to another member. The plug weld symbol is a rectangle with a diameter symbol placed to the left of the symbol as well as the number associated with that diameter.

Under what circumstances are plug and slot welds used?

When are plug and slot welds used? 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.

How far apart should plug welds be?

The minimum center to center spacing for plug welds shall be 4 times the diameter of the hole. The minimum center to center of slot welds (traverse direction (this way II) shall be 4 times the width of the slot. Longitudinal direction (–) shall be 2 times the length of the slot.

How are plug welds measured?

Plug Weld Dimensions Dimensions of plug welds must be shown on the same side of the reference line as the weld symbol. The size of a weld must be shown to the left of the weld symbol.

Are plug welds strong?

This is best done with a plug weld clamp. Step 5: Now the final step, placing the weld.

What size hole for plug welding?

Plug welding. Start off by drilling 7.5mm holes in the front sheet of metal at a spacing of normally 25mm to 40mm (or whatever the original spot weld spacing was). Then clamp this sheet onto the back sheet. 7.5mm is a reasonably good hole size for 0.8 or 1.0mm sheet.

What is a plug Weld?

Plug welds are a round weld that is made inside of an existing hole most commonly in one piece of metal, welding that piece to another member. The plug weld symbol is a rectangle with a diameter symbol placed to the left of the symbol as well as the number associated with that diameter.

What is the symbol for Weld?

Weld Symbols On A Reference Line: As you can see in image A below the symbol for the weld is on the underside of the reference line. When the weld symbol is on the underside of the line it is called the ‘arrow side’. In image B you can see that the symbol for the weld is on the top side of the reference line.