The Ultimate Test of Welds !!

[vicegrip]

You can see the ship bending , in the hall-way shots!!


http://www.youtube.com/watch?v=NE_ri8PkihE


This will be my next job , a berth on this boat !!

http://www.youtube.com/watch?v=e7NB-bN-ns4

[MXtras]

Wow!

I find it hard to believe the ship can flex that much and not fail after a few hours under those loads. When did they invent rubbersteel?

:eek:

Scott

[vicegrip]

Wow!

I find it hard to believe the ship can flex that much and not fail after a few hours under those loads. When did they invent rubbersteel?

:eek:

Scott

After many years at sea......My Dad told me the only broken welds were on things attached to the ship ....like those hook-shaped spars that the life-boats hung on.

In the next port they would hire welders to repair....the cracks !
He said that once in a while a welder would "critique" (put mildly) the welder who proceeded him.....usualy saying "not nearly enough HEAT".

My Dad said he wasn't sure what that meant , but that the welds usually held-up after the author of those coments was done .

VG

[Blacksmith]

Large manmade objects subjected to nature have two choices, flex to absorb large impact loads (engineers call this toughness), or resist movement until it breaks. Put a piece of steel in a vice and hammer on it, it'll flex and bend, put a piece of cast iron in the vice, PUT ON SAFETY GLASSES, hammer on it and it'll break. If you fly on an airplane through rough weather, watch the wings flex.

[Some Creep]

**blargggggghhhhhh.......*** <--- just puked on my shoes

...ugh... who could hold their lunch working on a ship doing that? Makes me wanna puke just watching it!

Here's a couple shots of what our local ferrys have to contend with here in the Puget Sound sometimes. The winds get to whip up some decent sized waves in our natural bath tub we live in. These boats usually ride near horizontal 99.8% of the time and aren't fun to be on when this happens. They ride VERY shallow in the hull.

[Mudsplasher]

Ships are built to flex. I have been on aircraft carriers (Saratoga and Kennedy) and they flex several different directions at once.

I work on Great Lakes freighters now, and see broken welds quite often. These are two of the lakers I have sailed as an engineer,

http://www.youtube.com/watch?v=PAjFOqmTVsM

http://www.youtube.com/watch?v=6JSfPBJdB3k

[Pumpkinhead]

Wow!

I find it hard to believe the ship can flex that much and not fail after a few hours under those loads. When did they invent rubbersteel?

:eek:

Scott

why the skepticizm? the WTC swayed as much as 2', Sears Tower 1.5', Hanc0ck Center 14", Petronas Towers 2' all but one (circumstances beyond control) still standing.


it's a matter of scale, that ship is near a quarter mile in length, to deflect that little is an engineering marvel.
even glass will deflect.

[Some Creep]

even glass will deflect.


Once. :D







LMAO, sorry had to.

[Mudsplasher]

And Rosie O'Donnel say in the WTC collapse it was the first time in history that fire melted steel.

Welding is magic, huh?

[Some Creep]

Guess she never heard of the 'forge' before.

Maybe she thinks horseshoes grow on trees?
(don't fall asleep underneath one if they do Rosie!)

[Blacksmith]

Actually glass will behave ductilely (deflect) a considerable amount before breaking. Don't take my word for it, look up the Hankock tower (spelling error intentional due to aggressive PC software) in Boston, a new building in the '70's where the windows spanned two stories. The wind was able to bow (deflect) the center of a two story sheet of glass far enough to pop the entire sheet out of its frame and the unbroken sheets were shattering on the streets before.

[Some Creep]

Yeah, that was a joke on my part, actually. :D

I have vibration files relative to motor and pump failures and have info for the flexing of glass and ceramics included. Amazing stuff!

[txfireguy2003]

In some circles, glass is actually considered a fluid. For example, over many many years, a sheet of glass, standing vertically, will "run" downward to the point that the bottom edge will be measureably thicker than the top edge! That's with no heat at all. I also have seen glass develop air pockets when subjected to heat. On one of my city's ladder trucks (fire truck) that was parked directly in front of a housefire one night, the windshield developed air bubbles from the heat of the fire. Of course, the plastic lenses over the emergency lights melted and the paint blistered LONG before that happened.

[MXtras]

why the skepticizm?

No skepticizm here - I understand the strength/flex/toughness relationship well it's just not part of my personal experience to see that magnitude.

It's just amazing to actually see such deflection in action.

Scott

[whateg0]

In some circles, glass is actually considered a fluid. ...

As I recall, glass is technically a supercooled liquid.

Dave

[Joe H]

As I recall, glass is technically a supercooled liquid.

Dave

You could say that about most materials..... You know, the 4 states of matter. Solids, liquids, gases, and plasma.

You could also say that water is a solid, heated past its melting point....

[TRG-42]

If you ever get a change to go under the deck of a large bridge, its pretty freaky. Large trucks cause a wave on the deck !


There is a graphic example on how buildings are constructed to allow for sway

Here is one of only 6 center support columns on a huge building . At every floor the center columns have another level just sitting on the one below. There is no welding keeping the columns together. . Only fastening are the 4 bolts that keep the column from "kicking out" if impacted

The purpose of this is in a seismic event, the building can sway about these columns . They are essentially controlled hindge points

When this picture was taken 4 floors were in and none of the columns were finish bolted. They were just sitting on each other . Can't imagine the pressure !

http://i30.photobucket.com/albums/c347/TRG42/Column.jpg

BTW the flange on the beam in th picture is 3" thick to give you an idea of the scale.

[vicegrip]

Most people after a very long time start to sag and get wider at the bottom , does that mean they are technically a slow moving liquid.??:D

[vicegrip]

If you ever get a change to go under the deck of a large bridge, its pretty freaky. Large trucks cause a wave on the deck !


......................

Love to see this Stuff Thanks:cool:

[bobad]

You could also say that water is a solid, heated past its melting point....

I always thought water was ice juice. :D


When I was a kid, I used to cross a large steel river bridge on foot. It was built of massive steel girders, but when I would run, it would start rocking and clanking. It's amazing that an 80 pound kid could make a mega ton steel bridge rock so much.

[Pumpkinhead]

In some circles, glass is actually considered a fluid. For example, over many many years, a sheet of glass, standing vertically, will "run" downward to the point that the bottom edge will be measureably thicker than the top edge!

well this has been the contention for quite some time, it has been disproven.
the thickness variation is due to the pane being very old and the method of manufacture inexact. i have seen old glass that was like looking through a funhouse mirror.

not that anyone cares:
It is sometimes said that glass in very old churches is thicker at the bottom than at the top because glass is a liquid, and so over several centuries it has flowed towards the bottom. This is not true. In Mediaeval times panes of glass were often made by the Crown glass process. A lump of molten glass was rolled, blown, expanded, flattened and finally spun into a disc before being cut into panes. The sheets were thicker towards the edge of the disc and were usually installed with the heavier side at the bottom. Other techniques of forming glass panes have been used but it is only the relatively recent float glass processes which have produced good quality flat sheets of glass.

source:
http://math.ucr.edu/home/baez/physics/General/Glass/glass.html

[Willy Victor]

Ships are built to flex. I have been on aircraft carriers (Saratoga and Kennedy) and they flex several different directions at once.

I work on Great Lakes freighters now, and see broken welds quite often. These are two of the lakers I have sailed as an engineer,

http://www.youtube.com/watch?v=PAjFOqmTVsM

http://www.youtube.com/watch?v=6JSfPBJdB3k

I believe the Blough is a US Steel boat and the Ryerson is Inlands. I think I worked on the Ryerson one time when She was tied up at Inlands pier. Repaired the insulation in the boiler room

[mooseye]

Probably need some of that Jb stuff.
To stick your iced tea glass to the diner table.