Tig Help please
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Honda-Tech Member
Joined: Jul 2004
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From: minneapolis, MN, usa
Tig Help please
Well i was welding some mild steel today and i can run a bead pretty good, the only thing is at the end of the bead i get a crater. Is it because i let off the pedal right away??? am i suppose to feather it out at the end? any help would be appreciated thanks fellas
OG Fabricator
Joined: Mar 2003
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From: Knoxville, tn, 37912
Re: Tig Help please (fullblown)
Yes, taper the heat a bit slower and you won't get a fisheye.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.
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Joined: Nov 2003
Posts: 1,307
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From: salem, or, usa
Re: Tig Help please (Engloid)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Engloid »</TD></TR><TR><TD CLASS="quote">Yes, taper the heat a bit slower and you won't get a fisheye.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.</TD></TR></TABLE>
Nice way of explaining it. thanks.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.</TD></TR></TABLE>
Nice way of explaining it. thanks.
Joined: Jan 2004
Posts: 484
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Re: Tig Help please (Engloid)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Engloid »</TD></TR><TR><TD CLASS="quote">Yes, taper the heat a bit slower and you won't get a fisheye.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.</TD></TR></TABLE>
good explaination but you mispelled cooling
but yeh, he pretty much summed it up.
What happens is this:
Imagine a large plate that's 12" square and you put heat directly in the middle, then you turn off the heat. The outer areas will cool down faster than the middle. The same happens in the puddle. The center is hotter, so as the outer edges cool, they shrink and suck the liquid metal towards them...leaving a hole in the middle.
if you slow the cooing at the end, it will cool slowly enough that it can't do this.</TD></TR></TABLE>
good explaination but you mispelled cooling
but yeh, he pretty much summed it up.
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