mig

[kez]

could any1 tell me what the permitted weave is on 1mm or 1.2mm standered a18 wire using argon 20% co2 the job is 20mm lifting lugs general standerd 50 b grade carbon steel 2 15mm end plate fillit welded vertically up the way ive been doing it is block it out 1st pass to 8 , 10mm leg length then a split of 2 stringers up 2 the 14mm leg length but sum of the guys have been capping of in 1 which i thought was bit wide the job is usually dun downhand theres no procedure 2 cover the verts can anybody shed any lite on this thx

 

[dai]

finish the job in stringers only weave 3-4mm

 

[kez]

finish the job in stringers only weave 3-4mm

what is maximum permitted weave on 1m or 1.2m wire , it big oil company which is being tested by ndt guy thx

 

[dai]

pass

i was always told not to weave more than 2.5-3 times the width of the filler
and stringers were the strongest way to do it


but i aint a proffesional

 

[TechnicAl]

If there is no WPS you can really do whatever you want. Usually it would be controlled by the Heat Input limits which in turn will determine the max weave width / travel speed.

 

[kez]

can any1 recomend the lowest thickness 4 aluminium mig using basic 3 faze basic cv mig welders , was asked 2 do wps by the boss ad no problem with 5ml but 2ml punched threw on fillets and lap joints , boss tryin 3ml but i think 4ml maybe 5 , 2 do gud job anybody shed any light on this thx

 

[volition82]

Can't help with the aluminium but with the vertical welding I would say your right with the maximum weave but what type of ndt testing is it? If it's ultra-sonic you'll have problems with lack of sidewall fusion with the bigger weaves but if it's only magnetic partical/red dye all you really have to worry about is cold lap and you'll get away with bigger welds.

I would guess it would be magnetic particale testing as iirc ultra-sonic can only be done on a minimum of 12-15mm fillet welds and it isn't very accurate, magnetic particale would be the more obvious choice. If it was me and I didn't know the type of ndt testing I would do the multi runs as it may take you longer to weld but it's a hell of a lot quicker and a lot less work than having to grind them out and re-weld.

 

[kez]

kez

Can't help with the aluminium but with the vertical welding I would say your right with the maximum weave but what type of ndt testing is it? If it's ultra-sonic you'll have problems with lack of sidewall fusion with the bigger weaves but if it's only magnetic partical/red dye all you really have to worry about is cold lap and you'll get away with bigger welds.

I would guess it would be magnetic particale testing as iirc ultra-sonic can only be done on a minimum of 12-15mm fillet welds and it isn't very accurate, magnetic particale would be the more obvious choice. If it was me and I didn't know the type of ndt testing I would do the multi runs as it may take you longer to weld but it's a hell of a lot quicker and a lot less work than having to grind them out and re-weld.

thx that wot i thought , thank god sum1 else got sanity

 

[kez]

agree with you but ndt guy here been welder 20yrs progressed to inspection of npi/dpi only and thinks he can do astecily good looking single run cap on 14m fillet weld fortunately i made them see sense were doin them on 2 split stringers on cap, the job still got come under scutinee of big british oil company inspection just hope it ok