Fluxes and Wires (SAW) For Low-Alloy Steel

LOW ALLOY STEELSAW

 

1.SELECTION   RECOMMENDATION:

According to AWS A5.23, wires are classified to solid wire, combined wire, and flux cored wire. Flux are classified by Two-Run or multiple pass, level of tensile strength and impact, heat treatment or not, adding slag or not. 

 

The classification for SAW is detailed. For multiple pass, besides the wire, the weld metal also need to be classified. For two-run, only need to classify the wire or the weld metal. The classification and application is as below:

 

Application

Wire Classification

Bare  wire composition

Weld metal composition

Bare wire Classification

Weld metal classification

Multuple Pass

(FXXX-EXXX-XX)

Bare wire

To be classified

To be classified

1. Carbon steel:Low, medium, and  high, manganese. 

(Low, medium, and high group)

 

2.Heat resistant steel:

Carbon molybdenum

(A group) and   chrome molybdenum 

(B group)

 

3.Low temperature steel:

 Nickel(Ni group)

 

4.Special steel: chrome nickel molybdenum

(F group) and military(M group)

 

5. atmospheric corrosion resistant steel: 

chrome nickel copper(W group)

 

6.Regular multi classification:

In accordance to the design of manufacturer

1.A group( Carbon molybdenum): 

A1, A2, A3, A4

 

2.B group(chrome molybdenum):

B1, B2, B3, B4, B5, B6, B8, B23, B24, B91

 

3.F group(chrome nickel steel)::

F1, F2, F3, F4, F5, F6

 

4.M group:

M1, M2, M3, M4, M5, M6

 

5.Ni group:

Ni1, Ni2, Ni3, Ni4, Ni5, Ni6

 

6.W group: atmospheric corrosion resistant steel

 

7.G group:

In accordance to the design of manufacturer

Combined wire Or Flux cored wire

--

To be classified

--

Same as above

 

Two-Run

(FXTXX-EXX)

Bare wire

To be classified

--

Same as above

--

Combined wire Or Flux cored wire

--

To be classified

--

Same as above

 

 

 

2.Welding Operation:


(1)Storage:


①Welding consumable should be stored in where without high temperature and humidity, and the packing should not be easily damaged. To avoid the moisture. 

 

②Preheat is suggested for SAW flux before using, 350℃×1hr for Sintered flux, and 200~300℃× 1hr for melting flux. 

 

The un-melted flux after welding could be added with new flux if sieved, but the ratio should not be over 30%. For higher alloy or special usage, do not use the recycled flux.

 

 

(2)Note:


①To prevent burn-through for the first pass of groove welding, manufacturer’s suggestion is backing welding semi-automatically before surfacing welding. 

 

②The cover length of flux is that the arc expose a little bit through the flux. Either too much arc or flux will cause porosity or pitting. 

 

③When welding steel plates thicker than 50mm, every bead should overlap the one before for more than 2/3, in case any cracks happening when the beads cooling down after welding because the pass is too thin.

 

Preheat, the temperature between passes, and PWHT should be strictly managed to avoid cracks result from cooling too soon and cell embrittlement.

 

View:

SF-68 x SW-60G

≧550N/mm2級高張力鋼單層、多層SAW銲接
AWS A5.23 F8A2-EG-G
JIS Z3183 S584-H
EN ISO 14171-A S 50 3 AB SZ
GB --

SF-66 x SW-60G

≧550N/mm2級高張力鋼單層、多層SAW銲接
AWS A5.23 F8A8-EG-G
JIS Z3183 S584-H
EN ISO 14171-A S 46 6 FB S3Si
GB --