Mild Steel & High Tensile Steel: Covered Electrodes (SMAW)

1.  Electrode Recommendation:

In accordance tensile stretch level, engineering design and workpieces type, choice different welding method and consumables. Ex. Classification by 70Ksi or 80Ksi tensile strength suggest for construction industry. But welding method would use SMAW, FCAW, GMAW, SAW, EGW and ESW option.


Electrode identification by a steel rod covered flux means covered electrode. AWS and JIS classification for Carbon Steel Electrodes a following:

 

Type of Covering


 

 

 

Specification

Classification

High titania sodium

Iron oxide titanina potassium

High titania potasium

High Cellulose type

Low-hydrogen

Low-hydrogen iron powder

Iron powder, titaniar

Special type

AWS A5.1

--

E6019

E6013

E6010

E6011

E7016

E7048

E7018

E7024

--

JIS Z3211

E4303

E4319

E4313

E4310

E4311

E4916

E4948

E4918

E4924

E4340

Weld result

Anti-crack

Porosity defect

Impact result

Management

Welding position

Flat

Horizontal fillet

Vertical-up

Vertical-down

 *1

Overhead

Groove weld outlook

Flat

Horizontal fillet

Vertical  /Overhead

Penetrate

Spatter

Slag removable

continuous arc welding 

Note:

      Very well   Well   Bad    : Not availble

     1: Special for vertical down welding position (AWS A5.1 E7048)

 


2.Tips for welding:

1. Storage & handing:

Storage must be dry to perform properly. In order to avoid moisture absorb, DO NOT storing with excessive moisture (≧80%R.H) and higher temperature (30℃) ambient.

Non-low hydrogen type proper absorb moisture easily than Low Hydrogen electrode. Due to that, restores the electrodes is more important.

Low hydrogen electrodes to be re-dried should be removed from the can and spread out in the oven because each electrode must reach the drying temperature. Store electrodes from the open containers in heat cabinet at 100~150℃. Remove few electrodes from the container to avoid long exposure high humidity. Please follow up re-drying indication as attachment.


2.Caution:

Minimize the possibility of oxidation, humidity, oil and rust appears on workpieces. Because of hydrogen content increased would be caused defect, make sure for clean ambient before welding.

In order to avoid porosity or crack defect by moisturize, please ensure short arc welding for low hydrogen electrode.

Based on low hydrogen electrode welding, the relative position of the weld bead and flame/arc keeping 1~2cm, welding technique can be of two types – forehand and back hand. Use forehand welding to push welding arc eliminate porosity defect.

In order to maintain weld metal quality, the weaving volume is usually limited to 3 times the electrode core diameter. 

Windproof measures requirement, when wind flow over than 3m/s from out door. Air entrainment nitrogen in welding bead. Porosity and low impact resistant might be caused by the absorption of nitrogen.

WPS does not allow excess heat input, that would be caused bigger grain and low impact resistance.


View:

SC-10

軟鋼SMAW銲接
AWS A5.1 E6010
JIS Z3211 E4310
EN ISO 2560-A E 38 3 C 2 1
GB T5117 E4310

SL-50

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7016
JIS Z3211 E4916
EN ISO 2560-A E 42 3 B 1 2
GB T5117 E5016

SL-56

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7028
JIS Z3211 E4928
EN ISO 2560-A E 42 2 B 5 4
GB T5117 E5028

SL-58

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7018
JIS Z3211 E4918
EN ISO 2560-A E 42 3 B 3 2
GB T5117 E5018

SM-13

軟鋼SMAW銲接
AWS A5.1 E6013
JIS Z3211 E4313
EN ISO 2560-A E 38 0 R 1 2
GB T5117 E4313

SM-10

軟鋼SMAW銲接
AWS A5.1 E6019
JIS Z3211 E4319
EN ISO 2560-A E 35 2 RA 1 2
GB T5117 E4301

SM-03

軟鋼SMAW銲接
AWS --
JIS Z3211 E4303
EN ISO 2560-A E 35 2 RB 1 2
GB T5117 E4303

SL-241

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7024
JIS Z3211 E4924
EN --
GB --

SC-11

軟鋼SMAW銲接
AWS A5.1 E6011
JIS Z3211 E4311
EN ISO 2560-A E 38 3 C 1 1
GB T5117 E4311

SM-26

軟鋼SMAW銲接
AWS --
JIS Z3211 E4340
EN --
GB --

SGCP

開槽、切斷用銲條
AWS --
JIS --
EN --
GB --

SL-24

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7024
JIS Z3211 E4924
EN --
GB --

SL-50D

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7048
JIS Z3211 E4948
EN ISO 2560-A E 42 3 B 3 1
GB T5117 E5016

SLH-58

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7018-1 H4
JIS Z3211 E4918
EN ISO 2560-A E 46 4 B 3 2 H5
GB T5117 E5018

SL-58M

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7018M
JIS Z3211 E4918
EN ISO 2560-A E 42 3 B 3 2
GB T5117 E5018M

SL-50DR

490N/mm2級高張力鋼SMAW銲接
AWS A5.1 E7016
JIS Z3211 E4916
EN ISO 2560-A E 42 3 B 1 2
GB T5117 E5016