В качестве непотребляемых электродов можно использовать вольфрамовые или углеродные электроды. В дуговой сварке газ-вольфрама электрод вольфрама использован вместо электрода металла используемого в защищаемой металл-дуговой сварке. Инертный газ, такой как аргон, гелий или углекислый газ используется для защиты металла от окисления. Тепло от дуги, образующееся между электродом и металлом расплавляет края металла. Металл для сварки может быть добавлен путем размещения голой проволоки в дуге или точке сварки. Этот процесс можно использовать почти со всеми металлами что производит высокомарочную сварку. Однако скорость сварки значительно медленнее, чем в других процессах.
Дуга Газ-МеталлПри сварке металлическим газом оголенный электрод экранируется от воздуха, окружая его аргоном или углекислым газом, а иногда и покрывая электрод потоком. Электрод подается в электрическую дугу и плавится в каплях, которые попадают в жидкий металл сварного шва. Большинство металлов могут быть соединены этим процессом.
ФлюсомДуговая сварка под флюсом аналогична дуговой сварке между газом и металлом, но в этом процессе газ не используется для защиты сварного шва. Вместо этого дуга и наконечник провода погружаются в воду под слоем гранулированного легкоплавкого материала, который покрывает сварной шов. Этот процесс также называется электрошлаковой сваркой. Она очень эффективна но может быть использована только со сталями.
контактная сваркаПри сварке с сопротивлением тепло получается от сопротивления металла потоку электрического тока. Электроды зажаты на каждой стороне частей, которые нужно сварить, части подвергаются большому давлению, и сильный ток приложен на короткий период времени. Пункт где касаются 2 металла создает сопротивление к подаче течения. Это сопротивление вызывает тепло, которое расплавляет металлы и создает сварной шов. Сварка с сопротивлением широко используется во многих областях производства листового металла или проволоки и часто используется для сварных швов, изготовленных автоматическими или полуавтоматическими машинами, особенно в автомобильной промышленности.
I learn new things at this lesson-я узнал много нового на этом уроке
Teacher teaches pupils maths- учитель учит учеников математике
I want to study geography next year - я хочу изучать географию в следующем году
This week I had written to her gynecologist for a check. And in the morning I got a call very early from the hospital and was told that due to the fact that someone has canceled my account, I can come to them already in 9. 30. I had just sent his family to school and work and the clock is already a quarter to nine, and to the doctor was 35 minutes. By this, I was in a hurry. As probably most of the women before visiting the gynecologist I wanted to take some time to intimate hygiene, but this time I had too little time for thorough care, so I just grabbed a wash cloth, lying on the sink, and a quick substitution of its help to at least have a "presentable" appearance. I quickly threw the rag into the tank of dirty laundry, dressed quickly and went in haste to the clinic. There I had to wait a few minutes before I was able to get in to the doctor's office. Since I, like many women, is familiar with this procedure for many years, I routinely climbed on a chair, staring at the ceiling and imagined, as if I'm in Paris or in some other remote location. The doctor came and I must say that was a bit surprised when he said, "Oh, today we tried!" I did not say anything and was relieved perceived end of the procedure. Rest of the day I spent on household chores - cleaning, shopping, cooking. . . When finished schoolwork, my six year old daughter returned home. She played one in the bathroom when she shouted: Mom, where's my wash cloth? "I told her that she was in the wash, and that she took himself clean. But she replied:" No, Mom, I need to be the one which was lying on the sink, I've put into it all their glitter and stars!
<span>If I could change something, I would change Russian series. Here is the mask of true evil, the seat of the vices, the citadel of evil. The rest would not touch. Of course, our lives are far from ideal: incorrect state politics, commercialism and the earthiness of people, the wrong upbringing of children, illness, bad weather, eggplant... the list is endless, the keyboard will endure. But if flush eyes with soap impartiality, after a brief tingling, offer a different picture of the universe. The world is beautiful and generous. And he made each of us are two of the most precious gift is life and choice. More space should nothing to anybody. Only man, unlike all the flora and fauna of our blue ball, can live, ignoring the instincts that dictate the genetic code. Good or bad, is irrelevant - the fact remains. And tricking your natural programming, we have created a world that deserve where each person or is in his place, or trying to get there. Those who need a power - seeking in politics who need money in a business but who needs truth in philosophy. Therefore mankind and stably. Someone said that life would be easier without the hordes of naasti and tragedies that await us at every turn of fate. Fundamentally disagree. In General, all the problems and ills of mankind can be divided into two types. First, there are those that are born in our heads, the latter - those that fall on our heads from the centrifuge universal chaos. First in reality does not exist, the latter can neither predict nor prepare for them. They both make each person unique. And only born so beautiful polymorphia life, with all its variety of features and expression. Freeing the mortal's problems - we turn it into another type of mammal living in harmony with the world. But harmony is boring. I want to suffer, to rejoice, to love, to blush from embarrassment and fear of the future. I want to make mistakes, to repent of them and make them again. And there is no more suitable for this soil. than life in this imperfect society. How many great books would not have been written, do not suffer from author inner demons, how many wonderful inventions would not have been invented if scientists felt comfortable in the cold, hot world, how many personal discoveries slipped away from me, be afraid I'm out of a comfortable, soft, but damn little comfort zone. The paradox is that our world is beautiful in its imperfection. Hard in it to perfectionists, but they would be suffering, he found himself in the center of perfection, because then their position in life would have no meaning, no possibilities for existence.
People always want to change the world, make it better. In principle, it is harmless and progressive desire, if not one "but". People always wanna change the world only to benefit themselves, to erode under his personal desires, ignoring the desires of others. Well, they can understand. But people don't realize that their desires other more treacherous beauties. Today they like one thing, tomorrow another. And to indulge every whim - worlds is not impossible to satiate. So live, cursing, cherishing his life. Such variability we need nothing less than eagle wings, and the rabbit long ears.</span>