Comparison of Welding Electrodes Of Type E6013 & E7018

E7018:

It is a basic coated low hydrogen iron powder electrode suitable for welding heavy structures, high tensile strength jobs where impact strength at sub-zero temperatures are required. With an increased metal recovery due to the presence of iron powder, enhances the welder to complete the job faster. The basic coated formulation ensures a defect-free radiographic quality weld. The superb and well established flux formulation ensure excellent performance of the electrode in AC/DC(+) in all welding positions except vertical down.

Advantages:

• Uniform and soft metal transfer

• Easy to control weld pool and slag.

• Suitable in DC (+) and in AC too.

• Increased weld deposit of about 115% ensures faster welding.

• Neat weld profile in fillet joints.

• High tensile strength and excellent toughness in sub-zero temperatures.

• Suitable for highly restrained joints.

Applications:

It is suitable for all sorts of joining, repairing and fabrication of structural works medium and high tensile steels of grade 550 N/sqmm., The applications include; welding of Structures, highly restrained joints, bridges, railway coaches & wagons, plants, ships, tugs, barges, trawlers, dredgers, storage tanks, boilers, pipelines, grills etc.

Typical Chemical Composition of Weld Metal:

Current Conditions: 

Typical Mechanical Properties of Weld Metal:

Diffusible Hydrogen Content: 5 ml/100gms. of weld

Moisture content in the flux covering: 0.6%

Re baking recommendations: The electrodes should be re-baked at 350°C for one hour prior to use and maintained warm till the job is completed.

E6013:

It is a rutile based, medium coated general purpose electrode suitable for welding mild steels. The superb and controlled flux formulation ensures excellent performance of the electrode in AC/DC(±) in all welding positions. With its soft, forceful & steady arc, easy slag detachability, fine rippled & shiny bead, and characteristics like easy maneuverability in all positions make E6013 a

Welder-friendly electrode.

ADVANTAGES:

• Uniform metal transfer

• Easy to control weld pool and slag in all positions.

• Suitable for either polarity in DC and in AC with OCV as low as 45V.

• Takes care of poor fit-up joints and fills wider gaps with superior quality weld.

• It can be used as a touch electrode.

APPLICATIONS:

It is suitable for all sorts of joining, repairing and fabrication of structural works in mild steels. The applications include; welding of Structures, bridges, automobile bodies, automobile parts, machinery fabrication, steel furniture, railway coaches & wagons, ships, tugs, barges, trawlers, dredgers, storage tanks, boilers, pipelines, grills etc.

Typical Chemical Composition of Weld Metal:

CURRENT CONDITIONS:

TYPICAL MECHANICAL PROPERTIES OF THE WELD METAL:

Comparison:

For welding first of all we select a suitable electrode. While selecting an electrode we follow some rules to select a suitable electrode.

v The first rule says that the electrode must be selected according to the composition of Base metal.

v The tensile strength of base metal must be close to the tensile strength of electrode being selected.

v While selecting an electrode, the moisture content must be considered. If it has moisture then it must be baked before its use.

In our practical we were facing the sputtering during welding when we were using electrode E7018, but when we used E6013 then there was not much sputtering and we were getting a fine bead.  After the research work I found these factors that were affecting our welding.

v In E7018, it has 0.6% moisture content and we did not baked it before its use and E6013 has no moisture content, so it could be used without baking.

v The composition of our sample was not known, but we can say that there is a possibility that the composition of E7018 was not matching with our base metal.

v After using E7018 and E6013 we could say that the tensile strength of our base metal was low and we were using electrode with 70,000 Psi Tensile strength. So it could also be the reason of sputtering.

Conclusion:

                  At the end we may conclude that the sputtering was due to Moisture content, different composition of base metal and electrode and due to the much difference in tensile strength of base metal and Electrode.