dimension for fillet weld

[Souravbohray]

what should be leg length and throat if thickness is given in drawing only ?
how to decide it should be fillet of equal leg length or unequal leg length?
if the T joint ( fillet ) plates thickness are same or different than how do decide throat and leg size without help of drawing ?
please reply on the basis of asme sec 9 only.

[George Dilintas]

in some codes is 0,7 T

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[sandeep kumar]

ASME Section IX is silent regarding your query.

[sandeep kumar]

Lets start with code practice, The throat size or leg length measurements is code specific i.e. EN or ISO code emphasis on throat (a) measurement while the AWS, ASME based on leg length criteria (that what you will generally found in the drawing or refeering AWS A2.4 or ISO 2553.. 

Now referring AWS D1.1, 

AWS D1.1 state that the minimum size fillet weld shall not be smaller than the size required to transmit the applied load ( clause 2.4.2.8) and table 5.7 gives the minimum size of fillet weld required based on base metal thickness involved. The weld measurement of size is the leg length.

while designing or working as per EN/ ISO codes the requirements of minimum and maximum fillet weld is 

Maximum size of fillet weld = 0.7t (where t is the plate thickness, smallest thickness in case of dissimilar thickness involved)

Minimum weld size is based on the application of the weld e.g. for railway the minimum fillet weld shall be 3 mm for aluminium and 2 mm for steel. Here the weld measurement is in terms of throat size. (above is as per EN 15085-3).

For structural welds, design based on DIN 18800-1 is 3 mm.

Above maximum size of fillet weld is based on shear loading criteria. according to which the maximum load that can be transferred by a fillet weld will be 0.7 times of plate thickness. a weld size beyond this will be waste of the resources.

Thanks & regards

Sandeep Kumar

On Friday, August 3, 2018 at 7:56:10 PM UTC+3, Souravbohray wrote:

[Lakshmankumar Bayyana]

All the answers will not be shown in ASME SECTIONS

ASME is a reference guide.

Required leg length, throat thickness, equal or unequal leg lengths, staggered welding or continuous welding, pitch for stitch welds all will be decided and confirmed by designers based on the loadings and design calculations 

ASME code will guide you how to do?

Thanks and Regards 

Lakshman kumar. B 

+91 9440031459

Sent from my iPhone

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[José Juan Jiménez Alejandro]

The information of the dimensions of the weld fillet if they are in ASME, but this information is not in Section IX, is in Section VIII Div. 1, which is the Construction Code and Dr. George Dilintas has already given the answer from the beginning.

Regards!.

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Ing. José Juan Jiménez Alejandro

ASME Independent Consultant 

and Technical Manager SSI-TPI

Cel. +52 812 352 4606

Skype: jjjimeneza

Twitter: @jjjimeneza