9 replies to this topic

[GT Jimmy]

Probably been asked on here many a time but what's the best size bit for plug weld holes? Was thinking 6 or 7mm. Thanks

[Marco1972]

I use 6 MM on 99% of my plug welds
5mm occasionally

Edited by Marco1972, 25 September 2016 - 08:52 AM.

[alex-95]

6MM for me to

[GT Jimmy]

Thanks. Off to screwfix now

[Ben_O]

Go 8mm in more structural areas although i expect you will read this after you return from Screwfix 

[GT Jimmy]

Go 8mm in more structural areas although i expect you will read this after you return from Screwfix 

Indeed I did haha

[sonikk4]

1/4" is perfect for most heavy duty applications. BUT remember the size of the flange will dictate what size drill bit to use.

The smallest I will go down to is 3/16ths. 5/32nd is too small. The hole will fill first without making a decent puddle of weld to the underlying panel rendering it weak.

8mm Ben is a monster but I can see its application in a couple of areas.

[Ben_O]

8mm Ben is a monster but I can see its application in a couple of areas.

A majority of plug welds i would do using a 6mm hole but i do like to go a bit overkill in some areas like heel and toe boards. the other option using 6mm holes is to space them quite closely to give more strength.

[GT Jimmy]

8mm Ben is a monster but I can see its application in a couple of areas.

A majority of plug welds i would do using a 6mm hole but i do like to go a bit overkill in some areas like heel and toe boards. the other option using 6mm holes is to space them quite closely to give more strength.

On the front toe boards I drilled the spot welds out using an 8mm spot weld drill, just thought it would get the welds easier. Guess I just got lucky haha

[minidaves]

6 or 8 mm depends