Selecting filler metal

[hanyu]

In case that I am aware of the chemical composition and the tensile strength of base metal that has not been designated based on a national or international standard, could you please let me know how to select filler metal for the welding.

[wefel]

Even though the material is not designated, you are aware of two important characteristics of it, the tensile strength and the chemical composition. The strength of weld metal defined as matching, overmatching or undermatching. Matching strength means that the filler metal deposits weld metal with strength close to the base metal's strength (matching tensile strength doesn't always result in matching yield strength since in many cases a match of both yield and tensile strength is not feasible). Depending on the joint type and loading conditions you shall match (it is generally required for full penetration welds in tension applications) or may undermatch (this could be more economical) the filler metal (e.g. application that requires partial joint penetration). In addition, matching the chemical composition of the base metal is generally desirable to assure that the weld metal has the same characteristics as the base metal. Nevertheless, it is not only these two characteristics that determine the appropriate filler metal, since for the final selection of the filler metal you shall consider low hydrogen necessity, impact requirements, hardness limits, PWHT as well.

[Bharat]

Also, we can use the same material of base metal as electrode, as it will have the same Mechanical and Chemical values. But i think it will not be the same case when we are welding two different materials.

[Logosweld]

A filler metal is a metal added in the making of joint during welding, brazing and soldering.The filler metals are used or consumed and become a part of the finished weld. The definition has been expanded and now includes electrodes normally considered non-consumable such as tungsten and carbon electrodes, fluxes for brazing, submerged arc welding, electroslag welding, etc. The term filler metal does not include electrodes used for resistance welding, nor does it include the studs involved in stud welding.

Filler metals can be classified into four basic categories. These are:

Covered electrodes
Solid (bare) electrode wire or rod
Fabricated (tubular or cored) electrode wire
A category of miscellaneous or others.

[Smiti]

A filler metal is a metal added in the making of joint during welding, brazing and soldering.The filler metals are used or consumed and become a part of the finished weld. The definition has been expanded and now includes electrodes normally considered non-consumable such as tungsten and carbon electrodes, fluxes for brazing, submerged arc welding, electroslag welding, etc. The term filler metal does not include electrodes used for resistance welding, nor does it include the studs involved in stud welding.

Filler metals can be classified into four basic categories. These are:

Covered electrodes
Solid (bare) electrode wire or rod
Fabricated (tubular or cored) electrode wire
A category of miscellaneous or others.

Totally agreed about the concept of filler metal

[Logosweld]

for selecting filler material one should have the knowledge of the other metals also for which the filler material is to be used for welding purpose

[Logosweld]

A filler metal is a metal added in the making of joint during welding, brazing and soldering.The filler metals are used or consumed and become a part of the finished weld. The definition has been expanded and now includes electrodes normally considered non-consumable such as tungsten and carbon electrodes, fluxes for brazing, submerged arc welding, electroslag welding, etc. The term filler metal does not include electrodes used for resistance welding, nor does it include the studs involved in stud welding.

Filler metals can be classified into four basic categories. These are:

Covered electrodes
Solid (bare) electrode wire or rod
Fabricated (tubular or cored) electrode wire
A category of miscellaneous or others.

Totally agreed about the concept of filler metal

that's really nice post,helpful for all and beginners also

[Logosweld]

Even though the material is not designated, you are aware of two important characteristics of it, the tensile strength and the chemical composition. The strength of weld metal defined as matching, overmatching or undermatching. Matching strength means that the filler metal deposits weld metal with strength close to the base metal's strength (matching tensile strength doesn't always result in matching yield strength since in many cases a match of both yield and tensile strength is not feasible). Depending on the joint type and loading conditions you shall match (it is generally required for full penetration welds in tension applications) or may undermatch (this could be more economical) the filler metal (e.g. application that requires partial joint penetration). In addition, matching the chemical composition of the base metal is generally desirable to assure that the weld metal has the same characteristics as the base metal. Nevertheless, it is not only these two characteristics that determine the appropriate filler metal, since for the final selection of the filler metal you shall consider low hydrogen necessity, impact requirements, hardness limits, PWHT as well.

Much more for the beginners nice post about the filler material

[Logosweld]

Selecting filler metal is also very important and it really depends on the welders knowledge that how to use it.

[Logosweld]

selection of filler material depends on the metals to be welded so welder should have good knowledge of all this things

[Logosweld]

selecting filler material should must depend on the types of the metals to be get welded,based on the behaviour of that we should select the filler material for welding

[Logosweld]

i think a very good or perfect welding depends on the filler material which is chosen to weld the two metals that definitely enhances the welding quality as well as the strength and behaviour of the metal