fans for sunscreen

[folle76]

Hello.
I would like to know from some expert in welding (which is either a welding technician or even a welding engineer (from what I understand, there are these figures)) what are the best parameters to weld the attached joint.
I would need a more academic than industrial response. the static and fatigued estate must not come into question (they have already been verified by me and others).
list here the data so far collected by a welding technician from us consulted:
1) non-radiographable welding, nor ultrasonic welding. only macrographs can be done.
2) the optimal preheat ranges from 50°c to 80°c.
3) it is advisable to make a first tig pass with intake material and finish the welding wire.
4) seems to be useless postheating or heat treatment of distension as it is trivial and weldable carbon steel.
My question is:
to avoid glues, porosity, lack of penetration and to have a class b according to iso 5817, is it correct as all written above?
Can you do something else? Can you work on cianphrine?
a higher preheating and thermal treatment of distension improve the results highlighted by macrographies? or is it pure theory?
is it true that the only way to avoid disputes by the customer passes by a wps agreed by the parties, otherwise this type of joint could always be subject to disputes by the customer, since macro "perfect" is impossible to have them?
Is there any other kind of contractual or ndt control solution you can do?
I thank all those who want to participate in the debate.

 

[SHIREN]

Hello.
I would like to know from some expert in welding (which is either a welding technician or even a welding engineer (from what I understand, there are these figures)) what are the best parameters to weld the attached joint.
I would need a more academic than industrial response. the static and fatigued estate must not come into question (they have already been verified by me and others).
list here the data so far collected by a welding technician from us consulted:
1) non-radiographable welding, nor ultrasonic welding. only macrographs can be done.
2) the optimal preheat ranges from 50°c to 80°c.
3) it is advisable to make a first tig pass with intake material and finish the welding wire.
4) seems to be useless postheating or heat treatment of distension as it is trivial and weldable carbon steel.
My question is:
to avoid glues, porosity, lack of penetration and to have a class b according to iso 5817, is it correct as all written above?
Can you do something else? Can you work on cianphrine?
a higher preheating and thermal treatment of distension improve the results highlighted by macrographies? or is it pure theory?
is it true that the only way to avoid disputes by the customer passes by a wps agreed by the parties, otherwise this type of joint could always be subject to disputes by the customer, since macro "perfect" is impossible to have them?
Is there any other kind of contractual or ndt control solution you can do?
I thank all those who want to participate in the debate.

Hi.
if there are so many problems
Perhaps
oxyethylene welding
:36_1_5:
Thank you very much

 

[folle76]

I read that the oxyethylene welding has been completely replaced since 1940 by the arc welding (for reasons also economical I suppose)... but you say that this type of welding is less subject to the defects of the arc?

 

[meccanicamg]

how much passion for a welding. if the customer is necessarily one who wants more than necessary must at least pay well.
to see so the design and the few indications you gave I would say:
- s355jr does not need preheat to be welded
- all the carpenters after welding can be sent in replenishment of distension especially if it is necessary to remove truciole heavily
- if you have correctly sized the welding cord there is to make it realize by a good welder and if you want better penetration you can act on current and advancement
- for an optimal fusion it is necessary to keep the joint horizontal
- if the welder is good it does not change if he uses tig, electrode coated or wired or yet oxyethylene
- electrode creates slag that can be included in the casting bath. tig is very accurate. wire with inert gas is the optimum price solution
- the preheat you do it only with alloyed and non-carbon steels from c45 up
- the bevel of the cianphrinus could take shape in cup or half y to guarantee the joint class b reported to the cord 13x13
- definitely agreeing a wps and respecting it is what there is to do

 

[MBT]

more than agree with mechanicalmg.
Just a couple of reflections

- s355jr does not need preheat to be welded
- the preheat you do it only with alloyed and non-carbon steels from c45 up

small objection. but it is also true that a small preheat (on the order of 90-100°c) can be done for all steels, whether or not linked or low carbon, in order to eliminate the inevitably present moisture
if you need it or you don't need it... Let's say it doesn't hurt.

- all the carpenters after welding can be sent in replenishment of distension especially if it is necessary to remove truciole heavily

all carpenters they go ricotte after welding
I accept derogations only if the carpentry consists of solids "heavy duty" with very few light welds and if there are no subsequent processing

- if the welder is good it does not change if he uses tig, electrode coated or wired or yet oxyethylene

Well, I mean... we say that for some materials certain procedures are not recommended or even impossible. . .

- electrode creates slag that can be included in the casting bath. tig is very accurate. wire with inert gas is the optimum price solution

as much as a welding expert taught me, electrode is qualitatively the best (as long as you know how to perform well and clean well)
gmaw (wire) is excellent for large quantities of medium quality welding
tig indispensable for aluminum, excellent for the first past on special welding or for thin thicknesses

 

[folle76]

thanks to all for the information that they have consolidated and integrated what little I knew.

 

[meccanicamg]

electrode welding is the one that has mechanically best characteristics. so much is that there are electrodes for dissimilar steels, hard carry, brass alloys, aluminum alloys, stainless steel, basics for superior mechanical performance, cellulose for tubes and applications without brittle slag, iron and similar rutiles, cast iron etc.

In truth I have seen realize on a pipe diameter 80 thickness 1.5 mm welding with wide cap both tig and wire and inert gas and I have to say that aesthetically they were made identical. the wire welder who all call "the dragon" has a lot of years of experience and sand really everything flush, rule feed and current and brush stroke that is a pleasure.

tig welder which is called "carlet" has many years experience for tig and ossoacetylene welding. both work on light medium carpenters...that is, from 1mm to 3 days, occasionally 5 mm and almost never 8 and 10 mm.

clearly if you are doing everything to a heavy carpentry carpenter is all different: mentality, capacity, quality etc.

 

[SHIREN]

I read that the oxyethylene welding has been completely replaced since 1940

Hi.
is still used for welding of sheet or pipes of small thickness (up to 3 mm).
I don't know the thickness of your "bombola"
in the possible
but what must contain that "bombolone"
Thank you very much