[MW:7426] Re: 7394] sideffects of spatters why do they occur

Spatter is caused by several factors, the main factor being a
disturbance in the molten weld pool during the transfer of wire into
the weld. Typically this is caused by the relationship between
amperage and voltage. This is usually seen when the welding voltage is
too low or the amperage is too high for a given wire and gas
combination. In this situation, the arc is too cold to keep the wire
and pool molten and causes a stubbing effect of the wire. This can
occur at both high and low current ranges.

Other Factors are

1. In a short arc process, the weld droplet contacts the weld pool and
scatters the base metal before fusion.
2. When fusion occurs after short-circuiting and the weld bead heats
due to a large increase in current. This is essentially the problem
described above where the amperage becomes too excessive for the given
welding wire. This is also what most welders like to refer to as the
"arc explosion" or the popping that causes spatter.
3. An arc repulsion force causes the weld bead to break off and
scatter
4. Splashing occurs when a weld droplet falls into the molten pool.
This is very common in a globular transfer mode.
5. When the weld bead is affected by the magnetic repulsion force of
the short circuit in the weld pool.

Jaspal Singh, CWI-AWS, CSWIP-3.1
Quality Assurance
Process Equipment Division
ISGEC, Yamuna Nagar, Haryana -135001
Phone: 911732307251
Ext: 251 Mb: +91 9996624244

On Oct 6, 4:16 pm, "Sam Malemela" <smalem...@spc.co.za> wrote:
> Weld spatter result from incorrect current settings. This has adverse
> effects on corrosion protection coatings.
> Weld spatter is cathodic to steel and as such becomes the propagation point
> for corrosion.
>
> NS MALEMELA
> Contracts & Quality Manager [Special Projects]
> Southern Pipeline Contractors
> TEL:(011) 914-8519
> FAX:(011) 914-4524
> 082 389 2592 Cell
> smalem...@spc.co.za
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of rohit rawat
> Sent: Wednesday, October 06, 2010 11:24 AM
> To: Materials & Welding
> Subject: [MW:7394] sideffects of spatters why do they occur
>
> Hi there,
>            can anybody out there let me know the reason, why the
> spatter occurs and is this akind of defect or we simply remove them
> due to the asthetics.
> Rohit Rawat
>
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> - Show quoted text -

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.