Workboat in progress...

Hello, I am new to the forum and introduce myself
My name is Stefano, I'm an engineer and I write from Italy Reggio Calabria

Together with the company of carpentry work with and a study of ship design we designed and we are making a aluminum boat to work in the lagoon Category C of length 4.5 meters.

We are in the early stages of the end of the template with the sixth cut CNC plasma iron.

Then we will begin to assemble the aluminum sheets and weld.

I want to share with you this experience of boat building and listen to advice or do business with you.

thanks
Stefano

 

Stefano, the picture seems to indicate that you will use an external building jig. The boat will have a vee bottom fore and aft, but a flat bottom with beveled chines within the interior sections....The sides will be parallel. The flat bottom in the midsections will have a plan view that resembles a birdseye?....If that is the case it would be unnecessarily labor intensive with much welding required. Have I interpreted the picture correctly? In any case it is an interesting project.

Please post more details, including a drawing, if you wish to have constructive comments. Many members here are knowledgeable about boats and materials of the kind that you have mentioned.

 

Hello Messabout and thanks for the welcome to the forum
It 's true we are using a mask with the sixth iron 4 mm with CNC plasma
We are finishing the installation of everything and the stiffening plates with 3 mm.
The boat is in h111 5083 aluminum with a thickness of 3/4 with MIG and TIG welding.
It 'a work boat for inland lagoons
On the bow toward the dock will work accurately but we welders capable.

Just finished the mask and took precise measurements come out with a 3d final.

Just put the photos into defined forum

 

Maybe you could build without the external structure. Just an idea as shown in the accompanying figure.
I have experience in this type of work and would be happy to help you, if you consider it appropriate.

 

Thanks Tansl in this project we wanted to just build the boat upright and not upside down.
Do you update with fittings to verify the advantages of this kind of work.

 

As you can easily understand, not about building the boat upside down but to build it in a way that best to ensure the proper placement of the pieces. The equipment is placed once flipped and certainly not pulled the boat into the water until after it flipped. On the other hand, small block, it's quite normal to have to flip them in order to make the greatest possible number of welds "underhand" horizontal.
But this is my experience and what I have very clear is that each workshop should build the way he likes more, not my way.

 

Hi Stefano,
Some information about workboat requirements here in Northern Europe.
http://virtual.vtt.fi/virtual/fmav2009/en/

Hope you get some help of these quite similar to RCD rules with some "extrapolations" to keep durability, working safety and redundancy at professional level. Fits for small workboats from 2,5-24 meters.

NOTE! There are some editorial mistakes in this english publication like in the chapter concerning rudders! So make sure you have all the ISO-standards which are referred in this rule to to check that the level is at least similar to RCD. (Recreational Craft Directive).

 

work in progress

All set to welcome the aluminum parts and begin to baste the plates.

The only thing missing to put the strips of tape zinc-o-fix to avoid contact iron-aluminum and then you get started ...

Stefano

 

interesting keep up the good work

 

News avril 2013

in welding ......

Then we turn to structural reinforcements, then the floor and then ..... sea trial.

If you have any request from Italy are available ..

Stefano

 

Penetrant test

Some checks on welds with liquid penetrant testing ....

 

Does liquid penetrant, detect cracks or defects in the root bead?

 

The liquid penetrant testing shows cracks, craters, incomplete fusion, and porosity up to a few millimeters from the surface.

In the picture is the fillet weld plate 4 mm with 3 mm.

In these cases the test PT can be very useful..

 

Yes it can, of course, but, does liquid penetrant detect cracks or defects in the root weld?

 

An interesting post thank`s to all involved.