questions on E7010

[IA52 Glenn]

What material/applications do you run it on, and what technique is used?

TIA

[Desertrider33]

Run just like a 6010 (whip and pause or small circles). It is used where a higher tensile strength filler is needed than 6010.

[davedarragh]

What material/applications do you run it on, and what technique is used?

TIA

Glenn: Welcome to the forum, and a very good question. To dis-spell some myths, let's first review the class EXX10 electrodes.

They are a cellulose-sodium coated rod, designed for DC only use, and primary application is in pipe welding.

Depending on the strength (first 2 digits) some are used for root passes on X-56 and under to all passses from X-56 thru X-70 pipe.

EXX10 electrodes can also be used in all groove positions for plate, and excellent for 2F, or horizontal fillets.

Based on the flux and basic rod composition, this class of rods are known as "fast freeze," with very little slag, making them excellent for out-of-position welding.

When used for cross country pipe, the normal situation is a "penny land, penny gap," or 1/16" root face and 1/16" gap as recommended from API (American Petroleum Institute) 1104 code.

Depending on pipe strength, a 7P+ (E7010-P1) may be used for ALL passes from root to cap. Other times, for root and hot pass, other times, fill and cap passes.

The root pass is welded with a "drag" technique, forming a small "keyhole" as the open root is welded. Subsequent passes are made, and sometimes one or two "stripper beads" are required at the 2 and 5 o'clock positions, especially on thicker wall pipe. A slight side to side weave is used on the fill passes.

Shield-Arc HYP+ (E7010-G) are a little different in composition, and are classified as a "low alloy" fast freeze electrode. Same technique, same results.

You'll find each of the EXX10 rods have unique characteristics and uses.

A 5P or 5P+ has a much "softer" arc, and increases resistance to certain types of weld cracking, even if higher strength consumables are being used for fill and cap passes.

Hope this answers your questions.

Dave

[IA52 Glenn]

I've been running 5P and 6011 for years- I was trained at Lincoln;)

Why I ask is recently I had to attach 2X2X1/8 mild tube to the roofs of cargo containers, which are made of cor-ten sheet metal. I used 7018 on them, but it was hard to run due to the extreme amount of arc blow I encountered, the thinness of the steel, and the g*******d paint on the things was a bear to grind off (or weld through), and that didn't really seem to improve things at all.

So while I'm under the hood doing this, I wondered if that 7010 I heard about would have been a better option; I didn't want to use the 6010 or -11 due to the carbon content of the cor-ten (I think).

I don't believe 7010 existed when I first started out- I wasn't aware of it until I came back to this forum a few months back.

Whipping would have made the process a lot easier due to what I cite above, and the amount of gap I encountered, also.

Thanks.

[davedarragh]

I've been running 5P and 6011 for years- I was trained at Lincoln;)

Why I ask is recently I had to attach 2X2X1/8 mild tube to the roofs of cargo containers, which are made of cor-ten sheet metal. I used 7018 on them, but it was hard to run due to the extreme amount of arc blow I encountered, the thinness of the steel, and the g*******d paint on the things was a bear to grind off (or weld through), and that didn't really seem to improve things at all.

So while I'm under the hood doing this, I wondered if that 7010 I heard about would have been a better option; I didn't want to use the 6010 or -11 due to the carbon content of the cor-ten (I think).

I don't believe 7010 existed when I first started out- I wasn't aware of it until I came back to this forum a few months back.

Whipping would have made the process a lot easier due to what I cite above, and the amount of gap I encountered, also.

Thanks.

7010's have been out for quite some time, can't give you an exact industry date, but unless you went to Lincoln's school prior to WWII, it's a safe bet they've been around since you've "been back."

Dave