Only need to surfacing one layer, can meet the corrosion resistance of the weld tape

Tower is used for distillation, purification, absorption, distillation and other chemical equipment, most of the tower devices need to contact acid, alkali, salt, organic solvents and other corrosive media, so it is necessary to surfacing a large area of corrosion resistant layer in the cylinder and sealing parts. As an efficient way of surfacing, strip surfacing is widely used in tower welding of chemical equipment.
The traditional electrode surfacing technology is double-layer submerged arc surfacing technology with transition layer and corrosion resistant layer, but this technology has long manufacturing cycle and high manufacturing cost. In order to solve this problem, JingQunCo has developed single-layer surfacing welding materials (GDS-309LA welding strip, GXS-ED308L electroslag flux), which can achieve the effect of two-layer surfacing with only single-layer surfacing, and can simplify the surfacing process from two-layer surfacing to one-layer surfacing.

Introduction of the welding materials

1.The Chemical component

Rules/Name	C	Si	Mn	P	S	Cr	Ni	Note
NB/T47018.5 EQ309LA	≤0.030	≤1.00	0.5-2.5	≤0.025	≤0.015	21.0-23.0	9.0-12.0	solder strip
GDS-309LA	0.018	0.34	1.90	0.017	0.001	21.96	11.17	solder strip

 

Rules/Name	NB/T47018.5 FZ308-D	GDS-309LA+GXS-ED308L solder strip+ Flux combination
C	≤0.05	0.028	0.028	0.029	0.029
Si	≤1.00	0.58	0.64	0.62	0.64
Mn	≤2.5	1.33	1.33	1.35	1.33
P	≤0.030	0.018	0.018	0.018	0.017
S	≤0.020	0.004	0.004	0.004	0.004
Cr	18.0-21.0	18.21	18.47	18.39	18.28
Ni	8.0-11.0	10.12	10.31	10.27	10.30
Note	deposited metal	Welding surface	Under surface 1mm	Under surface 2mm	Under surface 3mm

2.Weld appearance

Recommended welding parameters

Specification(mm)	0.5*60
Electricity(A)	850-950
Voltage(V)	26-30
Welding Speed(mm/min)	150
Length(mm)	35-40
Lap welding(mm/min)	6-10
Thickness of flux spread(mm/min)	About 25

Weld pass thickness: about 4.7mm

Weld width: about 62.5mm

Weld pass appearance: beautiful shape, weld surface is flat, lap transition is smooth.

3.Mechanical capacity

Ferrite content (welded state)

Solder strip+ Flux combination	GDS-309LA+GXS-ED308L
Measured value	The ferrite content is about 7FN, and the ferrite percentage content is about 8%
Measuring position	Weld surface

Test method: GB/T 1954-2008 "chromium-nickel austenitic stainless steel weld ferrite content measurement method"

Bending test: