Contact: Jincheng Han
Mobile: 13042479777
Phone: 0411- 62310707
Fax: 0411- 87712449
E-mail: hjc2000@126.com
Add: No.42-84-7 Xianjin Street Jinzhou District, Dalian City, Liaoning Province
Contact: Jincheng Han
Mobile: 13042479777
Phone: 0411- 62310707
Fax: 0411- 87712449
E-mail: hjc2000@126.com
Add: No.42-84-7 Xianjin Street Jinzhou District, Dalian City, Liaoning Province
1.
General guidelines
Production and processing or hot-dip galvanizing of the entire steel component,
in some cases is often impossible, especially for those bulky components using
integral hot-dip galvanizing is problematic. In addition, component parts of
hot-dip galvanized parts, or semi-finished products of hot-dip galvanizing, are
sometimes required to be soldered on site.
Hot-dip galvanized steel and non-hot-dip galvanized steel, compared with the welding method used is basically the same. Basic research shows that, for the commonly used steel, the state of welding compared with the non-welded state, its hot-dip galvanized in the mechanical properties of the impact is not obvious. In the hot-dip galvanized steel welding method, manual arc welding is the most commonly used method. Gas welding is mainly suitable for the thickness of 3mm hot-dip galvanized steel sheet welding, but compared with the shortcomings of arc welding is the side of the weld surface of the galvanized layer to burn a little wider. For thicker plates, manual arc welding is preferred.
2.Welding practice
Because the welding process will produce
high temperatures, so the two sides of the zinc coating layer is easy to burn
or evaporate, which will affect the welding process. Therefore, compared with
the welding of non-hot-dip galvanized steel, hot-dip galvanized steel welding
process parameters need to be adjusted. The white vapor of zinc oxide generated
during the welding process blocks the line of sight, making the welding
operation difficult and complicated, resulting in sparking and unstable welding
processes. In such a poor operating environment, the weld is easy to produce
pores.
If necessary, hot-dip galvanized steel can also provide high-quality welds in
many applications without compromising the mechanical properties of the steel
components.
1) When the butt joints are welded, the
spacing between the webs is slightly larger than that of the non-hot dip
galvanized steel, which helps to remove the evaporated zinc and helps to
prevent stomatal formation. The same
applies to fillet welds.
2) The welding speed and welding
process on the quality of a greater impact. Welding speed is too high, zinc vapor
can not escape from the weld, and easy to penetrate the molten pool and welding
slag. Reducing the
welding speed and gently swinging the electrode facilitates the evaporation of
zinc and the dissipation of zinc vapor.
3) As mentioned
earlier, the evaporation of zinc will interfere with the welding arc, so a
slight increase in welding current will have a beneficial effect. The evaporation of the zinc is easier
because the welding current is increased to make the welding arc more stable.
4) Select the appropriate
electrode for hot-dip galvanized steel welding is very important. If the
electrode is capable of producing a slow-setting weld slag during welding, it
will be suitable for the hot-dip galvanized steel welding since the slow
solidification of the slag provides sufficient time for the zinc to escape from
the weld pool.
5) When hot
dip galvanized steel is vaporized, the steam containing zinc oxide should be
removed in time to avoid damage to the health of the welding workers. A vacuum cleaner or a dust cover is a convenient
commercial device