Hull Fillet Welding Scallop fit up
Hull Fillet Welding Scallop fit up
(OP)
Dear Sirs,
I would to ask for your opinion about below case.
Material: Mild Steel Ship Building Grade A
Thickness: 12 mm, 20 mm
Welding: Full Penetration, Continuous Welding - Watertight - Working in underwater conditions
My question is: Do we need a scallop at the vertical 20mm stiffener??
I would to ask for your opinion about below case.
Material: Mild Steel Ship Building Grade A
Thickness: 12 mm, 20 mm
Welding: Full Penetration, Continuous Welding - Watertight - Working in underwater conditions
My question is: Do we need a scallop at the vertical 20mm stiffener??





RE: Hull Fillet Welding Scallop fit up
I think you should saute the scallops and eat them. Then hire someone who understands welding and weld design to actually design whatever that is. It is unlikely that the welds are going to be full pen. welds and it may be possible that they should not be all around, without some special attention to detailing. Show us some well proportioned sketches, with all the important dimensions, load conditions, etc. What is this thing, what does it do, how is it loaded? How could you possibly expect a meaningful response with so little meaningful design info? We can’t really see it from here, and the photo doesn’t help much.
RE: Hull Fillet Welding Scallop fit up
Your message is well received.
However the style of your message indicates that you try to disorientate the case and create a faulty impression. I fully understand welding and weld design but it is not allowed to give further information. This is typical ship building rules for fit up inspection. Anyhow thank you for your reply.
RE: Hull Fillet Welding Scallop fit up
I thought dhengr was actually quite polite in his response.
You have basically given no information and then asked for an opinion on something that should be addressed by the vessels designers - not by somebody random on an internet forum.
So, when the weld cracks and the ship sinks what will your defense be in a court of law ? - "But Sir, they told me it was OK on the eng-tips forum"!
Regards,
DD
RE: Hull Fillet Welding Scallop fit up
You might be welding that ferry that Washington State just ordered and I could be riding it next year. That boat better not sink before I finish my beer!
RE: Hull Fillet Welding Scallop fit up
You need to read IACS No47. All the good info is contained in this code. All shipping classification societies use this as a base standard for repairs and new builds.
RE: Hull Fillet Welding Scallop fit up
Thank you very much for your replies. All of them are highly appreciated. I always work with IACS Rules and i agree with dieselofdog and BUGGAR about scallops. DekDee i understand your point. The reason of this post is because i always have to fight with welding foremen since they are doing deep back-gouging at below shell plate instead of scallops. They just follow their WPS which never mention anything about scallops. I believe that this practice is not quality satisfactory. Plus i cannot find any official reference about this specific case (class rules etc). Definitely some things rise up from experience only but i would like to know if there is any specification or general rule (depending on gaps or thicknesses) about scallop in such cases. For your information this is a wake fin welded to the outer hull of a vessel and i am not the designer of this device.
Regards
RE: Hull Fillet Welding Scallop fit up
I don't know IACS rules, but I am considering AISC/AWS.
RE: Hull Fillet Welding Scallop fit up