My background : Hobby welder, done an intro oxy, stick, MIG course Location : Australia (240v) My gear : Cigweld Compact Turbo 130A Single Phase (Transformer)
I've been doing some basic jobs (and a lot of practice) but am having a little difficulty with one project :
I'm trying to join a 30mm tube (4mm wall) to a piece of 5mm plate (swivel mount for a bar stool). Mild 'black' steel, ground clean.
Side view
| | | |
If you are in a position where you _need_ penetration, the best way to acheive that is with the joint geometry. In other words, while you are grinding the tube, grind a bevel on the edge, and/or make sure there is some gap between the tube and the plate.
Given that a large amount of an external weld gets ground off (to clear the swivel mount) I'll take a crack at putting a bigger bevel on the tube...
Cheers, Antony.
Anthony is making a point I have had made to me... While good (deep) weld penetration in fillet welds is good, it's hard work to get usually we are talking about a millimetre or so. One wipe with a
9inch angle grinder will give you something like 2mm "fillet root penetration" on welding with a process giving no weld penetration deeper than proper fusion.I think the suggestion is prep like this:
(have I got it correct???)
| | | | | | | tube | | | | | | / | / | / | /
I did a similar thing and I used a piece of filler wire between the tube and the plate as a spacer. Then I made some tack welds - took off my clamps and finished the welding. I am new at welding but this did work and I had to grind flush for the same reason. The biggest problem was warping from the heat - I used an AO setup. Greg
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.