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Welding electrode & selection
This document provides an overview of welding and career opportunities in welding technology. It begins by classifying welding into solid state welding and liquid state welding. It then discusses power sources for welding, including transformers, alternators, and electric generators. The document covers polarity for AC and DC output and electrode designation codes. It provides examples of electrode types and discusses factors for selecting electrodes, such as the base metal properties, welding current, and service conditions. Finally, it discusses career opportunities in welding technology.
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Welding electrode & selection
- 1. EXPERIENCE SHARING SESSION I WELCOMEYOU ALL THE ASPIRING ENGINEERING STUDENTS OF SHROFF S. R. ROTARY INSTITUTE OF CHEMICAL TECHNOLOGY (SRICT)
- 2. SESSION CONTENTS • Welding& Classification • Power source • Polarity • Electrode / Filler – Specification & Designation • Selection Criteria • Career options in Welding Technology
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- 4. CLASSIFICATION Solid state • ColdWelding • Friction Welding • Diffusion Welding • Hot forge Welding Liquid state • Electrical – Arc & Resistance Welding • Chemical – Gas & Thermit Welding Solid / Liquid State • Brazing • Soldering
- 5. POWER SOURCE Supply Power (240V or 440 V) Welding Machine Transformer (AC o/p) + Rectifier = AC or DC or Both Alternator (AC o/p) + Rectifier = AC or DC or Both Electric Generator (DC o/p) Output Power (Low Voltage & High Current)
- 6. POLARITY • For ACo/p, Electrode can be either –ve or +ve and same applies to work piece also. • But in case of DC o/p, the condition changes. • DC Straight polarity Electrode (-) and Work piece (+). Generally used in TIG welding • DC Reverse polarity Electrode (+) and Work piece (-). Generally used in ARC welding.
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- 8. DESIGNATION OF SMAWELECTRODE. E XX X X Electrode Minimum Tensile strength (psi) Position Last two nos. show flux and polarity Example: E7018 E – Electrode 70 - Minimum tensile strength (70,000 psi) 1 – All Position 18 – AC / DCEP low hydrogen potassium iron powder Positions: 1 – All position (flat, horizontal, vertical, overhead) 2 – Flat & horizontal Flux Coating & polarity: 0 – cellulose sodium DCEP 1 – cellulose potassium AC or DCEP 2 – Titania Sodium AC or DCEN 3 – Titania potassium AC or DCEP or DCEN 4 – Iron powder titania AC or DCEP or DCEN 8 – Iron powder low hydrogen AC or DCEP
- 9. TYPES OF SMAWELECTRODE E 6010 E 6011 E 6013 E 7016 E 7018
- 10. DESIGNATION OF GSAWFILLER ROD. Low alloy steel ER XX S-X HZ Electrode / Rod Minimum Tensile Strength (psi) Solid rod Chemical Composition Diffusible hydrogen designator (optional) Stainless steel ER XXX L Electrode / Rod Grade of SS Low Carbon Example: ER70S2, ER70S3, ER70S6 Example: ER304/304L, ER308/308L, ER309/309L, ER316/316L
- 11. ELECTRODE SELECTION • Basemetal properties. • Tensile strength • Welding current • Base metal thickness, shape & fit up. • Welding position • Specification & Service Condition.
- 12. Base material (CarbonSteel) Filler Electrode SA 285 (Low & intermediate temp. services P. V. C. S. plate) ER 70S2 E 6010 / E 7018 / E 6013 SA 515 Gr. B (intermediate & high temp. services P. V. C. S. plate) ER 70S2 E 6010 / E 7018 / E 6013 SA 516 Gr. 70 (Low temp. P.V. C. S. plate) ER 70S2 E 6010 / E 7018 / E 6013 Base material Filler Electrode SA 106 Gr. B (Seamless CS pipe) ER 70S2 E 6010 / E 7018 / E 6013 SA 333 Gr. B (CS Pipe for low temp. app.) ER 70S2 ER 90SN-1 E 6010 / E 7018 / E 6013
- 13. Base material (StainlessSteel) Filler Electrode SA 312 TP 304L TP 304H TP 310 (Austenitic SS Pipe) ER 308L ER 308H ER 310 E 308L E 308H E310-16 SA 240 TP 304L (SS Plate) ER 308L E 308-16
- 14. Base material (Dissimilar material) FillerElectrode SA 106 Gr. B & SA 312 TP 304L ER 309 L E 309 - 16 SA 516 Gr. 70 & SA 240 TP 304L ER 309 E 309 - 16
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