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Subject:
From:
"Schaefer, Chris" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Schaefer, Chris
Date:
Mon, 12 Dec 2005 08:47:09 -0600
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Thank you very much. I contacted our local Speeline/ Electrovert rep. and they did not mention this process whatsoever - interesting eh? It is nice to know that there is this forum in which there is much knowledge to be learned.

 

Thanks again everyone.

 

CAS



	-----Original Message----- 

	From: TechNet on behalf of Cheryl Tulkoff 

	Sent: Mon 12/12/2005 8:16 AM 

	To: [log in to unmask] 

	Cc: 

	Subject: Re: [TN] Preparing Solder Pot for Lead Free Processing

	

	



	Chris -

	

	We cleaned an existing tin/lead cast iron solder pot (Electrovert) and

	converted it to lead free with excellent results - verified by analytical

	reports for various contamination levels.

	

	We simply drained the pot, gently scrubbed and vacuumed, and replaced all

	the internal parts (pot drain valve, sumps/pumps/baffles). We also

	installed new finger brushes, conveyor chains, and fingers. The preheaters

	and housing areas were all vacuumed and wiped down as well.

	

	Tin "wash" procedure have been talked about but they are a pricey way to

	go. They basically involve using an initial sacrificial 100% tin bath and

	redrain (recycle) before final filling with your lead free alloy.

	

	The procedure from Speedline is cut and pasted here:

	SCOPE:  LEAD FREE UPGRADE PROCEDURE

	                                    ELECTRA / VECTRA

	

	      METHOD:

	

	

	      1.    Remove all nozzles, flowducts, pumps and all other components

	that are in the pot. Use

	                         protective equipment while performing this task.

	

	      2.    Leave heaters on while draining solder.

	

	      3.    Drain solder from the pot and scrape the sides and bottom to

	remove any solder residue and

	

	                         dross.

	

	            4.         This procedure will provide a contamination level

	well below the required specification as

	

	                      long as the pot was cleaned properly.

	

	         5. Change the solder pot configuration to lead-free. See the

	   Software Configuration Manual.

	

	      6.    Fill pot with lead-free solder and allow the solder to melt and

	reach the setpoint temperature.

	

	      7.    Once solder has reach the setpoint temperature de-dross the

	pot.

	

	            8.          Install the new lead-free flowducts, nozzles, pumps

	and other parts in the lead-free upgrade.

	

	                        The existing belts and pulleys and covers will need

	to be used. Use protective equipment when

	

	                        performing this task.

	

	      9.    Using the nozzle setup tools, level nozzles and make sure the

	pumps are seated.

	

	      10.       Have solder analyzed to ensure lead levels are below

	specification.

	

	Thanks,

	Cheryl Tulkoff

	Senior Reliability Engineer

	Phone:(512) 683-8586

	Fax: (512) 683-8847

	National Instruments

	11500 N. Mopac Expressway

	Building A

	Austin, TX 78759-3504

	

	

	

	

	

	             "Schaefer, Chris"

	             <Chris.Schaefer@S

	             UNTRONCORP.COM>                                            To

	             Sent by: TechNet          [log in to unmask]

	             <[log in to unmask]>                                          cc

	

	                                                                   Subject

	             12/12/2005 07:58          Re: [TN] Preparing Solder Pot for

	             AM                        Lead Free Processing

	

	

	             Please respond to

	              TechNet E-Mail

	                   Forum

	             <[log in to unmask]>

	             ; Please respond

	                    to

	             "Schaefer, Chris"

	             <Chris.Schaefer@S

	              UNTRONCORP.COM>

	

	

	

	

	

	

	Thank you all.

	

	So should I do one of the following:

	

	- Replace the solder pot altogether (the safest method, but most expensive)

	- Clean the existing cast iron pot as best possible then fill with Pb Free

	solder (higher risk, but less expensive)

	

	If anyone has cleaned their existing cast iron  solder pot, then how did

	you do it exactly? Is there a proposed method for doing this somewhere out

	there?

	

	Any suggestions would be very helpful.

	

	CAS

	

	             -----Original Message-----

	             From: [log in to unmask] [mailto:[log in to unmask]]

	             Sent: Fri 12/9/2005 11:10 AM

	             To: Schaefer, Chris; [log in to unmask]

	             Cc:

	             Subject: Re: [TN] Preparing Solder Pot for Lead Free

	Processing

	

	

	             Hi Chris,

	             Pb left in the old 'pot' may not be your biggest problem--look

	at these pics.

	

	

	

	

	             Regards,

	             Werner Engelmaier

	             Engelmaier Associates, L.C.

	             Electronic Packaging, Interconnection and Reliability

	Consulting

	             7 Jasmine Run

	             Ormond Beach, FL 32174 USA

	             Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904

	             E-mail: [log in to unmask], Website: www.engelmaier.com

	

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