Bad weld from spotwelder

K

kocetoMR

10 W

Joined

Jun 13, 2016

Messages

82

• Oct 16, 2020

• #1

one side is good ,other side is poor.
Spot welder is from 2P2S supercap 2.8V.Check the cable and connection,they are good.

What can be the problem?

 

K

kocetoMR

10 W

Joined

Jun 13, 2016

Messages

82

• Oct 16, 2020

• #2

 

K

kdog

10 kW

Joined

Feb 2, 2014

Messages

715

Location

hobart, tasmania

• Oct 16, 2020

• #3

Minor variation in electrode pressure or electrode tip shape would be my main guess in that order. My spotwelder is AC so I'm not sure about DC, but welders pay attention to polarity of their workpiece, try swapping tip polarity and see if it reverses. Can't think of anything else ottomh.

 

K

kdog

10 kW

Joined

Feb 2, 2014

Messages

715

Location

hobart, tasmania

• Oct 16, 2020

• #4

Have you tried actually spotwelding some nickel?looks like you're just hitting the can there.

 

K

kocetoMR

10 W

Joined

Jun 13, 2016

Messages

82

• Oct 17, 2020

• #5

every time when start weld needle neet luke like this

 

spinningmagnets

Moderator

Staff member

Joined

Dec 21, 2007

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12,955

Location

Ft Riley, NE Kansas

• Oct 17, 2020

• #6

Get some old bad cells, even disposable D cells will work. Use some nickel scrap and weld onto the scrap batteries. The longer path will add more resistance.

Nickel bus, and nickel-plated steel are very good for the parallel connections. For the series, I like the nickel-sandwich method.

https://endless-sphere.com/forums/viewtopic.php?f=14&t=108006

 

K

kocetoMR

10 W

Joined

Jun 13, 2016

Messages

82

• Oct 17, 2020

• #7

i use sandwich method in many battery pack.In my country copper is with high %gold and is difficult to weld direct to cell with sandwich method.