Welders Third... Clamp Thingy.

Introduction: Welders Third... Clamp Thingy.

About: Ews & qualified welder/metalworker since 1998

Hi this instructable is about making a very simple product.

Its actually just a one kind of diy spring clamp, with a simple improvement.


20 x 20 x 3mm angle iron

20 x 3mm flat bar

Strong spring. 120mm x 20mm x 2mm ( i used 120mm long and cut it half for two clamps )

M5 bolts. ( and smaller spring to keep extention locking screw save )

Paint.. optionally.


Welder ( used stick welder and 2mm rod. )


Thread tap. M5

5mm and 4mm drills

Angle grinder, 1mm cut off wheel and 60 grit flap wheel.

Step 1: Examples of Use.. Just Some of Them..

Video tutorial shows the whole process of making.

Reason to make these, instead of bying another set of plastic spring clamps..

First, plastic clamps tend to melt during welding or grinding... also those cheaper ones seems to break easily.

Cost of making one was only about 3-5$, i keep it very reasonable price.

Second, i really needed a solution for clamping smaller objects, bolts, nuts washers..

Smaller angle irons.. to hold ruler, try square, liner... rings etc.. when welding, gluing.. smaller objects.

Step 2: Cutting the Parts..

I used angle grinder and 1mm cut off wheel for cutting.

Measures are just for example, its very easy to make different variations for your own use.

From the 20 x 3mm flat bar.

2 pcs 50mm long, these are for the jaws.

One 40mm long, this is only for to give longer thread for the bolt that locks the extention arm.

Lenght is decided just for visual reasons, for symmetry.

25mm long, for to be used as a hinge. longer gives wider opening. ( 45mm for the ones with wider opening )

From the 20 x 20 x 3mm angle iron

2 pcs 200mm ( 5" ) long.

Tilted cuts are made 50mm from the left edge, and 80mm from the right edge.

50mm long cut starts 8mm below the upper edge, 80mm ends 12mm below the upper edge.

Step 3: Welding..

I used my cheap Telwin stick welder for welding.

With 2mm rod i set the scale to show 70A, but my experience says that real amperage then was about 50-55A

3mm is somewhat thick material for 2mm rod, so its very easy to weld.

I placed jaws about 1-2mm below the surface level of the edge, that leaves enough weld to it,

even when edge is grinded right angled.

Hinge piece is weld about 70mm distance from the "nose"

Step 4: Hinge and Tensioning..

I made a hinge from one M5 bolt.

I drilled 5mm hole to the " hinge plate " ( that 25mm long piece )

And then copied its placement to the second side of the clamp, and drilled 4mm hole to that location for M5 thread.

Then i located the placement of the spring.

Lenght and tightness of the spring needs to be noticed.. i tried two different variations that seemed to work nicely.

I cut my 120mm long spring to two pieces, 70mm and 50mm long parts.

Longer springs center point is located to 140mm from the nose, shorter 125mm.

Slots that holds the springs are about 10mm deep.

I measured the widht of the slots so, that springs are placed "inside" the clamp, then it doesn't snip your hand in use.

Also, i think result looks better that way.

Step 5: Extention...

Extention is made from 20 x 3mm flat bar.

Best thing is that it can be very easily to be changed longer if needed.

Step 6: Improvements..

This kind of design is very easy to modify to fill your own needs.

This is one example.

I simply added another extention to the other jaw, and filed simple grooves to it.

For holding round and small objects.

Personally i need this kind of option when brazing silver rings for the necklaces.

But, i bet i can find many other uses for that feature too.

Step 7: Finished...

Finished clamps with paint..

After the paint was dry i sanded it of from the jaws, from the area tha leans the workpiece.

That gives little better grounding.

Video shows the whole " how-to-make" process, and some examples of use.

Clamps are named " Welders.. ", but also i found them very usefull for gluing too, as the last pictyre shows.

But, if you need these, i think you allready have figured out i where to use them.

Thanks for watching!

Stay tuned..


Tuomas Soikkeli

Ps. I mentioned earlier that my next instructable is about making ring roller.. its coming.

You can watch the sneak preview from here:

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    11 Discussions


    1 year ago

    Good job , prroably going to make pair of these . Also great instructable


    1 year ago

    A few weeks ago I did my first welding since near 30 years past. Wow, what fun and games I had there! (I actually welded T pieces to the heads of some bolts)
    But it would have been so much better if I'd had these handy clamps! They are exactly what I needed!
    So when I dig the welder out again, these will be the first thing I make :)


    1 year ago on Step 7

    Tuomas - my hero ! I'm going to make these clamps, perfect for my tinkering jobs :)


    1 year ago

    Excellent video, full of information and action, no useless chit-chat or pointless musical introduction. Thank you.


    1 year ago

    Bravo! This is a great idea, thank you : )

    The other Finnish guy
    The other Finnish guy

    Reply 1 year ago

    Thank you Sam. I edited the instructable little bit.. i think its better now. :)


    1 year ago

    Looks like a very handy tool to have in my kit. Cant wait to start building it.


    1 year ago

    I like the extendable end piece

    The other Finnish guy
    The other Finnish guy

    Reply 1 year ago

    Thank you. Yep, that was the actual point on these. Didn't found commercial clamps where to adapt it. So, i made the whole clamps.