Projection Welding Design Guidelines. Throat Size 18 75o 38 h plate thickness weld size Butt h 0707 plate thickness 0707 weld size 14 Fillet. Projection height is typically 1 to 2mm depending on sheet thickness and weld strength required.
Brackets spigots and weld nuts to sheet metal where there is access from only one side and for making attachments to solid forged or machined parts. Projection included angle should normally be 90. Although tests indicate satis-.
Do not spot weld where flying sparks can strike flammable material.
The shape and size of coined or machined projections are unlimited but a dome shape with a diameter-to-height ratio of 3-to-1 is a good starting point. Over time individual manufacturers performing projection welding developed standards based on nugget size as an alternative to pulling tensile tests. Throat Size 18 75o 38 h plate thickness weld size Butt h 0707 plate thickness 0707 weld size 14 Fillet. Short length T joints eg.