Mild steel & High Tensile Steel: Electroslag Welding and Electrogas Welding
1. Electrode Recommendation:：
1. ESW(Electroslag Welding):
Electroslag welding was so called SESNET (Simplified Electroslag Welding Process with Non-consumable Elevating Tip) usually used to make square-groove weld for box column in steel construction segment. It is a high-efficiency welding process in which a non-consumable nozzle, which is used to guide the electrode, is designed to elevate automatically as welding progresses.
The SESNET process is most effective when it is used to weld. In order to avoid poor feeding wire or conductivity, standard package forms usually by drums. Ensure wire feeding smoothly with good copper coating on wire surface would be avoid welding bead apperance poor penetration and slag inclusion defect.
In accordance AWS A5.25 classification, the wire types include both solid and composite metal cored. And fluxes were classified by tensile strength and impact value.
See below chart for classification and usage：
Weld Metal Composition
Weld metal types
1.Medium-Manganese Classes： EM5K、EM12、EM12K、EM13K、EM15K
2.High-Manganese Classes： EH14
3.Special Classes： EWS(Weather resistant)、EA3K(Heat resistant)、EH10K、EH11K、ES-G
Metal Core Flux Wire
(2)EGW (Electrogas Welding):
Electrogas Welding is a continuous vertical position arc welding process but self-shielding is sometimes used. In EGW, the heat of the welding arc causes the electrode and workpiece to melt the flow into the cavity between the parts being welded. This molten metal solidifies from the bottom up, joining the parts being welded together.
EGW process usually use CO2 or MIX GAS (Argon, Argon/CO2, Argon/He Mixing Gas). A Self-shielding is sometimes used. In general, the flux cored usually large diameter but solid wire also been used. The welding recommendation as following condition：
AISI Grades 1008 to 1020
AC or DC
400 ~ 700A
In accordance AWS A5.26 classification, the wire types include both solid, flux cored and metal cored. And specification would be classified by tensile strength, impact value and weld metal composition.
Weld metal compositon
Weld Metal types
EGXXS-1 / -2 / -3 / -5 / -6 / -6 / -D2 / -G
Please refer AWS A5.26 Chapter A1 & A7
Flux cored and Metal cored
Please refer AWS A5.26 Chapter A7
①Be aware of wire scramble due to drum damaged.
②In general drum package formed by paper. Please keep away heat and high humid ambient.
③For Coil package form, please be careful wire damage or exposure humidity during moving.
①Check wire feeding direction from drum and be aware of wire scramble issue.
②In order to avoid poor penetration and slag inclusions defect. Please ensure wire feeding moving average works perfect.