Getting un-even welds (weaker on the positive side)

emaayan

100 kW
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May 10, 2012
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1,450
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israel
hi...

i'm using the Arduino v2.2 spot welder, with 140ah battery (should be 1000amps) and 21 ms pulse time (2 pulses) trying to weld 0.2 nickel strips.
the welding always strong on the negative side, but but very weak on the positive one, not only that, the positive probe sticks very well to the nickel after welding, as you can see from the video

[youtube]9GJqfZeIQlw[/youtube]

i also tried brand new probe and here you can see a comparison where on the left the used probe, and on the right the brand new one

f1b2NgVEeSRCfnBrIQLNRyl44Lih1quwqNsc_PFNTxOJarfADbQTFL2ySudp-o9k4-h98JqyTat1hqFJLSPR5_SMdhE_HsuTKG_J-CR1kmj6k1tXKtN1M5MnHVK9lB0GOVNhhVkQybAQhF3ZMPziIHykrbZzjexWiDnkAtQjxBfddQHxJOoo0rVzYJ6trJMnAenAIHlXSBYQ_SfwbCiY69ynOMadKe3vcYwq402ZTQSdxuMy7Mo3Zj5V7vqces6HAyadJrZ0Vh6vH-QJw5p0bIcJE4SiodXyKJMLto8PliIAdyAiYQsnLKYFUE0RtU4CEMi4lhx6Cm-4iiXkl0JNb_TpYTeAK-InMmKGYjWMsLLhtEtpOu53z0nvQJTzoqen83qqKktyXIARZcQqgaMwgb2BZaFBU1aiRLsMR9Ft-lqDQigagvavlHPNf6aWKWUz0S_3wNhYhrEdf9e9F8BXUJwZHvpVpPa2PCcREGrvIK1VyaLWwpqD7SwXb9pwyiFxuu58A0PVnamkvkMO6sLszmQ1ERjW5NmynB75eQFeNP3V1ZABz7cLu9VzsDdQ758s8pBuMDcXVD4PzuX3TEMBE1-tEuMnaZSnGFkY0Et3ULegZdo=w953-h715-no



and here you can see how it is after the one single weld

oCvfEXpkR5k6qCzw3jScqTc3ihjKa8oVtz-C88CjoALi1jUyGnrHp2d1044de-RLdhS1wbxM1uxnNsYOXYGxaPTm_XIEdE3pnl5GrUAWomoyVZq7vXNFCaKBuP1mq5ACYQF5pCxdnS4SiE8SWqgNT8glLOREQxGKw-UUHyzIBvCjL28ElmYmk--eufrw0KN1UmoS6VaFGKAc4yzhH7FniJiB53YpG0PG_D_T8S-rKRrEeMTBxlwRyxqHu12_hHXF51454Z9inYzK8Q1wJo-NjFG7WvwRBvNlZaIiS1uw0vxnT_C8TilYcXVc0abVI2zZ2LLZJ0Cw0dyUT2lZ671Hp3PKBAHfxcBifE3wnxPVa4vydk2StpVPtRgCQhGYsRID3XkkcId9IxmLghUK98Uu5KeCFC1tCwaY0-Uidx1JWz6lzPjtSwPxzwyfa_wU0dh5iDpffEVjQsn0KOBhl7wPwf1VjOtiixqYtG-Kyj5XDcSZgBKbr3Hj_oWYajM2luaKLQt5OTnaJB3cxVONTeoLMOIthUTrngYq7Vy7dWyH_aKIqVkxqnsuZVLyZ58nXZCF9U1brFVN_o6thY-4Z83BaytQ192x0CW2jAbPTjBQWeftCsI=w792-h1055-no


i believe the tip actually got stuck into the cell

2WBWRZCi6ju6z5po6gPX6N8WZ2w25NzJVLTNLWO7hANTkkBPe0lO5V88KRjGCWH9Yc3oJLibJLbC5NPh1Od5SIPnA6SKAz3UFFhil4kSAs0xmBUzK9y8QnfUBj8AaOMRnXNHLeKVYIHhozIDts3dtuoLD99SYbNE69gWOlJfUa7fHumK-L33lmZF2eUr9Riej0Xp65GM18etL2BEVOSaVo-fJKW4WwKa8H_CV-eA0yZYDoNS7CiENILWcXQPmJR5nh0ErChW48QurmPxp2CacmuISkOswTKQa_XPzfnfDEZZai-ublE9hViVyAzhFbV7E1uoZ2c4lJHWxF64Az7qr5De4ODZQpdpaU0wOQIbM1aEW4LMXO1Qydoy_zfChiqY_TRs9gmrVaZI7C4k7892LgtE-HpZmvmEmgiRRoMOZ3gUzW4EeJGVzivVcnE7rk3bVSv5nkEqn4SKzCRiKGx9kyYYRagzFXAgsl2zW6XfE_jH6M8zlOAWXLPIMd6o-o_RwUyfx0-VIITzhSPqxz2ZKurtnxs56wHkZ_2oNg8k43qnGN9DcdbUnkOUmsjqfG-Hd7UwbEFShq6YHnxTXWNUm23TrbBk7oLQyjY7JmLGKbYRLvE=w1408-h1055-no


so what could cause this?
 
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